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Literature: Orthogonal
"We need an age, and we don't have it. So we find the time elsewhere. We make a rocket powerful enough to leave the world behind.... When the rocket's history is orthogonal to the history of the world, no time at all passes back home. So for the travelers, the journey can last as long as it needs to. If they require more time to complete their task, they can prolong the flight for another era, another age; it won't delay their return by one flicker."
Eusebio, The Clockwork Rocket

A characteristically Hard Science Fiction Trilogy by Australian author Greg Egan. Consists of:

  • The Clockwork Rocket
  • The Eternal Flame
  • The Arrows of Time

Orthogonal is set in a universe where a single minus sign, deep in an equation governing the rules of spacetime, has been changed to a plus sign. Through the story, Egan explores the higher-order ramifications that change has on the laws of physics (and, by extension, on nearly every other discipline of science). Light has no universal speed (colors of light with shorter wavelengths, such as violet, literally travel faster than colors like red, which have longer wavelengths, meaning that distant stars appear as rainbow-colored streaks instead of white specks), and the generation of light creates heat and energy; reverse Time Dilation is in effect; and entropy works more or less backward.

The plot follows a group of Shapeshifting Starfish Aliens faced with an impending Class X-3 Apocalypse caused by incredibly destructive meteorites from Another Dimension. They realize they can't do anything to save themselves with their current technology, so they build a Generation Ship to fly into that alternate dimension, where they will have all the time they need to advance their technology to the point where they will be able to return and Save The World.

In true Greg Egan fashion, the trilogy mostly alternates between chapters that advance the plot and chapters that explore the scientific implications of the One Big Lie that governs the rules of the universe. The latter is mostly accomplished (again, in Egan's signature style) by having a few scientifically-inclined Mr. Expositions bounce Techno Babble off each other.

This Trilogy contains examples of:

  • Aerith and Bob: Throughout the trilogy, you have names like Clara, Tamara, and Ramiro... alongside names like Yalda, Tarquinia, and Eusebio.
  • Alien Geometries: Time is fundamentally the same as space, meaning that there are technically four spatial dimensions and no such thing as time. The trope is even discussed in-universe when Yalda hypothesizes "four-space" and Giorgio points out how batshit insane it sounds.
    Giorgio: So according to your theory, an object could have a trajectory entirely orthogonal to our own?
    Yalda: Yes.
    Giorgio: It could move with infinite velocity?
    Yalda: Yes, that's how we'd describe it. But that's no stranger than saying that a vertical pole has an 'infinite slope': unlike a mountain road, it gets where it's going vertically without bothering to go anywhere horizontally. An object that gets where it's going without bothering to move across what we call time isn't doing anything pathological; in reality, there's nothing 'infinite' about it.
  • Aliens Never Invented the Wheel: Justified with electronics; because of this universe's physics, basic electronics are not completely impossible to construct, but it is highly unlikely that sentient beings would ever discover the principles that would make it work without a lot of luck or help. Between the second and third books, though, they do invent "photonics", which serves pretty much the same function as electronics, except that it works by using photons instead of electrons.
  • All There in the Manual: Given that nearly half the trilogy consists of Techno Babble Expo Speak, it's hard to believe that Egan has posted multiple essays on his website that delve even further into the workings of Orthogonal's universe — and yet, here they are.
  • Alternative Number System: Numbers in the trilogy are always shown in decimal thanks to a Translation Convention, but it's strongly implied that the aliens use a duodecimal (base-12) number system.
  • Antimatter: Played straight and occasionally referred to by name, but usually just called "orthogonal matter". See also Collision Damage and Made of Explodium, below.
  • Apocalypse How: A Class X Planetary Destruction is anticipated early on, before the characters realize that they are actually facing a Class X-3 Galactic Destruction. note 
  • Artificial Gravity: The first part of the Peerless' journey involves accelerating at a rate of one-G for about a year, generating the predictable and familiar downward gravity. When they stop accelerating, the lack of gravity unexpectedly causes their crops to fail, so they spin the ship to compensate. Centrifugal Gravity is partially deconstructed and reconstructed, as the characters are forced to reconfigure most of the ship's layout to accomodate the fact that the new gravity just put all their furniture on the walls.
  • Big Damn Heroes: The Eternal Flame's climax is a textbook Big Damn Heroes moment. One of the two halves of the Ensemble Cast is kidnapped and held under the threat of death by extremists who believe their reproductive experiments are an affront to nature. They are rescued in a classic Big Damn Heroes scene by the other half.
  • Bizarre Alien Psychology: Mostly averted with some notable exceptions.
    • Since Death by Sex and Death by Childbirth always applies (for the women), men typically raise their children alone or with the help of their own fathers. Thus, women are widely (but not universally) considered unfit for childrearing.
    • Sex is a very complicated and touchy subject. It's obviously a biological imperative, but for a woman, it's suicide, and for a man, it's murdering your co. Despite this, most men have no qualms about their duty to reproduce, to the extent of shaming women who don't look forward to Death by Childbirth. Predictably, this strikes many of the female characters as an in-universe example.
  • Bizarre Alien Reproduction: Let me count the ways...
    • Sex immediately induces reproduction; there is no gestation period.
    • Sex consists of two of the Shapeshifting aliens melding the flesh of their chests, through which the male transmits a light-based signal into the female's body to induce the reproductive process. No actual matter or bodily substance is exchanged; genetic diversity is ensured through the infrared transmission of "influences" by every individual to everyone around them — which, incidentally, is also how diseases spread.
    • Females reproduce by splitting into four children; two sets of male-female twins respectively referred to as cos, who are genetically ideal mates for each other. The children who are not cos to each other are referred to as brothers and sisters, but the same terms are generally not used to refer to cos, probably to avoid implying that the relationship between cos is Brother-Sister Incest.
    • In the rare event that a woman is born without a co note  or is otherwise unable or unwilling to mate with her co, she can instead reproduce with another willing male, known as a co-stead. These relationships are treated more as a husband/wife relationship than the relationship between cos. It's considered a kind of reproductive Undesirable Prize, generally resorted to only when one co is dead or nonexistant, but there are occasional exceptions.
    • Under the right circumstances, primarily old age or spending too much time away from their co or co-stead, spontaneous reproduction is common enough to necessitate women taking a drug to prevent it.
    • In The Eternal Flame, things get even Weirder Than Usual: A woman fasting to the point of near-starvation helps to both stave off spontaneous reproduction as well as to ensure that, when it happens, it will result in only one pair of cos instead of two, for Population Control.
    • And even weirder note : Near the end of The Eternal Flame, the biologist half of the Ensemble Cast develops a way to induce childbirth that produces only one child, does not kill the mother, renders her sterile for the purposes of traditional (fission) childbirth, and is shown to be repeatable in the final book, and can produce male children. In other words, they can more or less reproduce just like us.
  • Bizarre Sexual Dimorphism: Mostly averted. Males and females don't look too different from each other, with a few exceptions. In fact, at one point a character witnesses an animal giving birth to a solo under unique circumstances, so there is no way to predict that the baby will be a female, as with all other solos. He realizes after the animal is born that he has no idea how to identify its gender without a co to compare them in size (the female would have been larger).
    • Even when they are not solos, women are generally larger than men, justified in that the extra mass is needed to successfully split into four healthy children. As a result, women are generally stronger than men and thus do most of the manual labor. note 
    • Without exception, every solo is female, including the ones born as a result of the induced survivable births, "shedding", in the latter part of The Eternal Flame. Later on they learn how to "shed" male children, so the trope is no longer universal.
  • Body Horror: Played straight several times, occasionally without even using any visual cues.
    • In The Clockwork Rocket, Yalda is sent to jail, where she is "shackled" by use of a resin that causes two of her limbs to be melded together, creating a loop that can be chained to a wall. This is described as a highly disturbing experience.
    • One experiment by the biologists involves recording the light signals used by the brain to induce muscle movement, and playing it back into the body to try and trigger the movements artificially. It doesn't quite work as planned, and the resulting uncontrollable hand spasms terrify the subject so badly that he tells his associates to cut off the hand. The effect is slightly lessened by remembering that he is a Shapeshifting Starfish Alien who can reabsorb the damaged flesh to heal the wound, but his brief Inner Monologue during the muscle spasms makes it clear that this is his reaction.
    • During the biologists' experiments on the arborines, Carlo views the surgical implements as being this.
    • Many characters have this reaction to the idea of any kind of deliberate interference with natural childbirth, but especially childbirth that would allow the mother to survive.
  • Call a Smeerp a "Rabbit": Orthogonal takes place in a universe with entirely different laws of physics from our own, and thus predictably Bizarre Alien Biology. It still uses common words like "plant" and "vole" to describe things that are roughly analogous. note 
  • Call a Rabbit a "Smeerp": Almost entirely averted, but played relatively straight with "luxagens", which are analogous to atoms in Real Life, and "photonics" in The Arrows of Time, which are analogous to electronics. Possibly justified in that they function fundamentally differently in several ways, but in this universe, what doesn't? Possibly another (extremely mild) example: Space, as in, outer space, is never referred to as such. It is always referred to as "the void".
  • Clarke's Third Law: Reconstructed and frequently discussed. The entire point of the Peerless' journey is to have an indefinite amount of time to develop sufficiently advanced technology that will let them Save The World from the impending Cluster-Shattering Kaboom, even though they have no idea what kind of technology it will be, or even if the people that return will have evolved enough to no longer be recognizable as the same species as those who left. See also The Singularity, below.
  • Collision Damage: Whenever matter that originated in clusters traveling orthogonally to each other comes into contact, it creates an immediate and massively explosive reaction. Combine that with the fact that, under ordinary circumstances, such clusters technically have infinite velocity respective to each other, and even a pebble of orthogonal matter can — and, in a combination Mass "Oh, Crap!" and Portent of Doom moment, does — literally Set A Planet On Fire. Overlaps with Made of Explodium, below.
  • Conveniently Close Planet: Mostly averted, but played straight with a Conveniently Close Asteroid. A large part of The Eternal Flame's plot revolves around a Big Dumb Object known as the Object, a large chunk of orthogonal matter that drifts close enough to the Peerless for the protagonists to travel to it. The characters invoke the trope by realizing that the Object is one of the greatest opportunities they've had since the launch, because if they lose it, they will probably never come this close to another. (Partially subverted in that it does take the crew of the Gnat several days to reach it.)
  • Covers Always Lie: The cover art for each book in the trilogy depicts the Generation Ship Peerless as a sleek and sexy Cool Starship, while the actual books describe it as looking exactly like what it is: A mountain that was hollowed out, reinforced, fitted with rockets, and blasted into space. The cover of the first book is particularly egregious, as it depicts no fewer than five such spacecraft. In fact, a second craft is constructed part of the way through The Eternal Flame, but that's it for the first two books.
  • Crapsack World: Invoked in The Clockwork Rocket by Nino, who quotes an earlier offscreen conversation with an opponent of the project.
    Nino: He said that if the mountain crashed into the ground, it would be a mercy. He said the whole idea of a city in the void was insane. One by one, things would go wrong — things that couldn't be fixed without help from outside. Within a generation you'd all be starving. Eating the soil. Begging for death.
  • Death by Childbirth: Universally played straight and justified by the fact that natural childbirth consists of the mother fissioning into four children.
    Yalda: I wish I could have met [my mother].
    Vito: That's like wishing you could fly.
  • Death by Sex: Universally played straight and justified by the fact that sex triggers immediate reproduction, which consists of the mother fissioning into four children.
  • Depopulation Bomb: Invoked by opponents of the reproduction-inducing experiments, who hypothesize that if survivable single childbirth always results in female children, it will lead to the eradication of the male gender.
  • Doomed Hometown: The entire trilogy revolves around an attempt to preemptively defy this trope and save their Doomed Home Planet.
  • Ensemble Cast:
    • The Eternal Flame actually features two sub-ensembles, each with their own separate story arcs, though they frequently interact.
    • The "Physicist" Ensemble: Carla, Tamara, Patrizia, and Ada, whose arc focuses mostly on the study of light and matter. They end up being Big Damn Heroes in the climax by rescuing the "Biologist" Ensemble from their kidnappers, and are generally more focused on the Peerless' ultimate, overall mission to Save The World.
    • The "Biologist" Ensemble: Carlo, Macaria, and Amanda make up the other ensemble, whose arc focuses more on biology, especially reproductive functions. They are generally more focused on solving the immediate problems faced by the crew of the Peerless, namely the overpopulation and resultant famine.
  • Exposed Extraterrestrials: Not usually significant to the plot, but the only instance of anything like clothing being mentioned is the "cooling bags" that must be worn during EVAs to avoid hyperthermia.
  • Exposition Diagram: Even for Egan, Orthogonal has an unusual amount of these. On average, at least two or three appear in almost every chapter, especially in the second book. More or less justified in Real Life, because the near-constant Techno Babble would be even more difficult to follow without them.
  • Expo Speak: The Book! Egan tones it down in the third book, though.
  • Farmboy: Yalda in The Clockwork Rocket, and several characters in The Eternal Flame, Tamara probably being the most notable.
  • Faster-Than-Light Travel: Thanks to the way spacetime works, there is no universal speed limit, and achieving FTL speeds is a surprisingly simple matter. Of course, you stop moving forward through time and end up in Another Dimension, but that has its own useful applications.
  • Fling a Light into the Future: A very unusual example. The Generation Ship's mission is to accelerate into Another Dimension, so that, from their perspective, time will stop for the homeworld. This will allow the crew all the time they need to develop technology and science to the point where they'll be able to return and Save The World. Thus, the ship may drift through space for an indefinite amount of time, but no matter how long they have, when they return, only four years will have passed on the homeworld.
  • For Science!: Defied in The Eternal Flame by the Council mainly due to not having Infinite Supplies, and further defied by a few extremists due to Science Is Bad, but otherwise played straight and thoroughly justified by the fact that the characters initially have no idea what they need to study in order to Save The World, so they pretty much just research anything and everything that comes to mind. The hope is that if they study enough subjects, something will lead to a revelatory breakthrough. This includes light, agriculture, biology, the fundamental building blocks of matter, and more. note 
  • Gendercide: Invoked by opponents of the reproduction-inducing experiments, who hypothesize that if survivable single childbirth always results in female children, it will lead to the eradication of the male gender. See also Depopulation Bomb above.
  • Genre Shift: The second book is a highly-technical romp through the science of the trilogy's universe, in which not much actually happens aside from a brief kidnapping plot for the climax. In contrast, the first and third book are much more plot-oriented, with the third book in particular being fairly action-packed. Whereas the first book has little action aside from the launch, and the second book's climax is over almost as soon as it starts, the third book is rife with sabotage, justified Timey-Wimey-ness, questionably Well-Intentioned Terrorists, and more than a few explosions (none of which are accidental, or have anything to do with Antimatter, unlike the previous books).
  • Homeworld Evacuation: Discussed a few times as one of the possible solutions to the Generation Ship's mission.
  • Hyperspace Is a Scary Place: Not least because Everything Is Trying To Kill You, including dust and even air thanks to the Collision Damage property of orthogonal matter mentioned above.
  • Infodump: Every other chapter, complete with Expo Speak, Techno Babble, and Exposition Diagrams. Less prevalent in the final book, which focuses less on discussing the science and more on the observing its practical effects.
  • Insufficiently Advanced Alien: Despite having almost no understanding of their own biology, no vehicles more advanced than a truck (and no understanding of what makes their fuel work except that it does), a social structure that regards women as walking wombs whose reproductive decisions (which inherently include dying) can and should be dictated by her male relatives, and no concept of basic electronics, the aliens still manage to build an indefinitely self-sustaining ship that can travel faster than the speed of light and (hopefully) come back with Sufficiently Advanced Technology to Save The World.
  • Just Before the End: The trilogy consists entirely of an attempt to defy this trope. The Generation Ship's mission is to suspend their Doomed Home Planet Just Before the End until they are able to figure out a way to avert the disaster.
  • Kill 'em All: Discussed. It's outright stated that everyone on the ship starving to death due to overpopulation and insufficient crop yields (and therefore rendering the majority of the trilogy, if not the whole thing, pointless) is a possible ending to the second book, which provides the motivation for the biologists and horticulturists in their attempts to defy it.
  • Lady Land: Invoked by opponents of the reproduction-inducing experiments, who hypothesize that if survivable single childbirth always results in female children, it will lead to the eradication of the male gender. See also Depopulation Bomb and Gendercide above, and No Woman's Land below.
  • Lecture As Exposition: Many of the Infodumps in the first two books take this form.
  • Mad Lib Thriller Title: The Clockwork Rocket and The Eternal Flame.
  • Made of Explodium: Whenever matter that originated in clusters traveling orthogonally to each other comes into contact, it creates an immediate and massively explosive reaction. Combine that with the fact that, under ordinary circumstances, such clusters technically have infinite velocity respective to each other, and even a pebble of orthogonal matter can — and, in a combination Mass "Oh, Crap!" and Portent of Doom moment, does — literally Set A Planet On Fire. Overlaps with Collision Damage, above.
  • Maternal Death? Blame the Child: Surprisingly averted. Surprising, because for most of the first two books it is universally accepted that a mother is utterly incapable of surviving childbirth — so Death by Childbirth always applies. This is almost universally accepted as a fact of life.
  • Medieval Stasis: A small-scale, justified, and very unusual (not least because it's not medieval) example that lasts about three years and Makes More Sense In Context: In The Arrows of Time, when the inhabitants of the Peerless construct a messaging system that allows them to send messages back in time, it results in the inability of anyone to come up with any new technological or scientific advances. This is pretty significant when you consider that up to this point, they have progressed from technology based on clockwork and combustion engines (or the equivalent thereof) to photonics (read: electronics) and nearly-Perpetual Motion Machines that are powered directly by light — all within six generations of the launch. SPOILERIFFIC note 
  • Minovsky Physics: Where to begin? Egan starts with a Real Life equation governing the structure of spacetime, and changes a minus sign to a plus sign. He then posits a universe where that equation is the correct one, and proceeds to extrapolate all the laws of physics from the quantum scale up to the structure of the universe itself. The trilogy is both a Save The World plot and an academic exploration of this hypothetical universe.
  • Mood Whiplash: Can be caused by the alternation between "plot" chapters and "Infodump" chapters for the first two books, but The Arrows of Time largely avoids it.
  • Mr. Exposition: Virtually the entire cast, who frequently spend entire chapters Infodumping Techno Babble at each other.
  • Narrative Shapeshifting: Partially reconstructed. One application of the Starfish Aliens' Shapeshifting ability is that they write by raising shaped ridges on their skin. They then either memorize the pattern so they can recreate it, or dust their skin with dye and press it to paper for posterity. When characters can't hear each other, either because the environment is too noisy or because they are in the silent vacuum of space, they instead communicate by "writing" notes on their skin for others to read.
  • No Woman's Land: Discussed. When people start panicking about the prospect of Gendercide and a subsequent Lady Land, one character points out that even if the biological gender currently called "men" no longer existed, women would then fulfill all the societal roles performed by men, which would force them to redefine the gender as a concept. He ends by slyly suggesting that eradicating all the men might actually end up creating a No Woman's Land.
  • One Big Lie: But the Lie is such a fundamental one, and is extrapolated on such large scales, that it leads to a universe that can feel more like Science In Genre Only.
  • One-Gender Race: Discussed as the inevitable result of a hypothetical Gendercide. Shown to have happened at the end of the trilogy; they don't consider themselves either male or female, but they are certainly one gender.
  • One True Love: Justified by their biology: A set of cos is biologically optimized to mate with each other, and most such couples spend their lives together as a socially acceptable cross between brother/sister and husband/wife. Co-steads, non-related couples who have decided to mate, are also examples to a lesser degree. Averted on several occasions, though, including Tamaro's imprisonment and near-attempted-murder of Tamara, which results in Tamara's estrangement from the entire family and Tamara's new co-stead explicitly telling her that he will completely abandon her if he believes that she never intends to mate with him, even if she has children by another (survivable) means.
  • One-Word Title: Orthogonal.
  • Parental Abandonment: Utterly justified by the fact that Death by Childbirth is universal for women. Discussed a few times, and ultimately defied by the development of a procedure that allows women to survive childbirth.
  • Perpetual Motion Machine: The titular Eternal Flame of the second book is a hypothetical chemical reaction that never exhausts itself, or at least one that continues for an absurdly long period of time, AND can be controlled and put to practical use, such as powering the ship.
  • The Plague/Synthetic Plague: Invoked by opponents of the experiments on survivable reproduction, when rumors begin spreading that the procedure has created an "influence" that can spread like any other disease, inducing the same phenomenon in anyone exposed to it.
  • Planet Spaceship: When they develop their Perpetual Motion Machine engines that are powered by light and consume (almost) no fuel, some characters discuss building massive engines on the Doomed Home Planet and propelling the planet to safety like a Planet Spaceship. At/after the end of the trilogy, though, they instead put out the sun and build engines on its surface, so that they can move it and let its gravity take care of pulling the planet along, which will cause fewer siesmic disturbances on the planet. At least partially justified, because In-Universe, the sun actually is just a big ball of flammable rock that is on fire, not a ball of gas undergoing a continuous fusion reaction.
  • Population Control: A major theme in the second book. Since every generation inherently doubles in size, crop yield and overpopulation on the Generation Ship quickly become a problem that puts the whole crew at risk. The trope occurs in the form of "the famine", the practice of women starving themselves so that when they reproduce, they will have only two children instead of four, and later in the form of a procedure that lets women give birth to only one child at a time.
  • Professor Guinea Pig: Played straight at least three times.
    • Despite extensive preparations and tons of redundant precautions, the construction and launch of the Peerless was still rushed. The original crew had every reason to fear that the launch of the Generation Ship might be an utter disaster and kill everyone on board before they even got off the ground.
    • Carlo during the light experiment. It doesn't go well.
    • In a desperate gambit to keep research on reproductive biology from being banned, Tamara volunteers to have the arborine reproductive signal used on her. It goes surprisingly well.
  • Puppeteer Parasite: Invoked almost by name during the light signal experiment, when Carlo loses control of his hand.
    He tried to clench his fist, but his body had news for him: the burrowing parasites owned that flesh, and they weren't taking instructions from him.
  • Rape Is a Special Kind of Evil: Invoked a few times. Thoroughly justified, not least because rape necessarily includes murder.
  • Save The World: The mission of the Peerless.
  • Sex Is Evil: Suggested and occasionally discussed throughout the trilogy, but ironically not discussed in depth until the third book, by which time sex no longer equals murder. Ramiro and Tarquinia discover the joys of recreational sex, and even though Tarquinia has already shed children and is therefore at no risk of fission, Ramiro still has serious reservations until Tarquinia talks him around. From his perspective, even though she's at no risk, he's still acting on a primal instinct that, if biology was allowed to take its course, would be tantamount to murdering Tarquinia.
  • Shapeshifter Mode Lock: A relatively minor example. When Carlo's hand starts spasming uncontrollably during the light experiment, he tries to reabsorb it into his body, but can't. It's implied that he was just so viscerally repulsed by the phenomenon that he couldn't make himself absorb the hand, rather than actually being physically incapable of doing it, but it still qualifies.
    Carlo began drawing the flesh in at his shoulder. He managed to shorten his arm by about a third before his body rebelled and halted the process. The prospect of bringing the afflicted hand any closer felt like ingesting something rotting and poisoned. And for all he knew, his body was right. What if it couldn't reorganize this flesh, any more than it could subdue a virulent parasite?
    "I can't do it," he said finally. "It has to come off."
  • Shapeshifting: One of the more notable traits of the protagonist Starfish Aliens.
  • Shoot the Shaggy Dog: Everyone on the ship starving to death due to overpopulation and insufficient crop yields (and therefore rendering the majority of the trilogy, if not the whole thing, pointless) is outright stated to be a possible ending to the second book, which provides the motivation for the biologists and horticulturists in their attempts to defy it.
  • Shown Their Work: The entire story could be considered a vehicle for Egan to show his work in extrapolating how physics would function in this universe.
  • The Singularity: Reconstructed and discussed. The entire point of the Peerless' journey is to have an indefinite amount of time to develop Sufficiently Advanced Technology that will let them Save The World from the impending Earth-Shattering Kaboom, even though they have no idea what kind of technology it will be, or even whether the people that return will have evolved enough to no longer be called the same species as those who left.
  • The Slow Path: A very unusual example that depends on your perspective in this universe's spacetime. The Generation Ship is essentially taking The Even Slower Path, deliberately (and literally) taking a roundabout path to the near future, so that they can have more time to figure out how to handle the future before it arrives.
  • Space Is Cold: Justifiably inverted. The Starfish Aliens don't seem to need to breathe, and the lack of pressure isn't an issue, so their only risk during exposure to the vacuum of space is that the lack of cooling air can cause them to overheat and die within minutes. See also Spontaneous Human Combustion below.
  • Space Is Noisy: Predictably (considering the author) averted, but the aversion is really only significant in that it forces an interesting use of the Narrative Shapeshifting trope, above.
  • Spontaneous Human Combustion: Life in this universe relies on chemical reactions that can and do occasionally get out of control, resulting in dangerous and spectacular instances of this trope. In fact, the trilogy opens with one.
  • Stable Time Loop: The theory of four-space, which states that the dimension of time is literally identical to any of the dimensions of space and that the universe is a closed loop in all dimensions, implies that the entire universe exists in this state.
    • Partially deconstructed in The Clockwork Rocket, when a character wonders if free will is just an illusion in such a universe, and Yalda explains her opinion of why it's not.
    • Fully deconstructed in The Arrows of Time. The main plot is driven by the idea of a messaging system that will allow people to send messages back in time. Cue extensive discussions about why this could not possibly lead to a Temporal Paradox.
    • At one point in The Arrows of Time, while en route to a planet that is essentially traveling backward through time, a few travelers have an interesting conversation about leaving a spyglass on the surface to decay: From the planet's "perspective", it will be as if a rock eroded into sand, which then gradually and autonomously formed itself into a spyglass, which would then be picked up by the visitors and taken off with them into space. Things get weirder when someone wonders what they may have on the ship with them that came from the planet that nobody has ever set foot on yet.
  • Standard Time Units: Almost entirely averted, in that time (and mass, and distance) are measured in units invented for the story. However, two of those time units are days and years. It's also implied that a "flicker" is analogous to a second.
  • Starfish Aliens: What other kind of life would you expect to evolve in a universe where the laws of physics are fundamentally different?
  • Storyboarding the Apocalypse: In The Clockwork Rocket, once Yalda predicts that a Hurtler will destroy the planet, her student Eusebio explicitly asks her to do this. note 
    Eusebio: I want you to imagine the worst, and then tell me how we can survive it.
    Yalda: The worst? The Hurtlers will keep coming, ever larger and in ever-greater numbers, until the odds that we're struck approach a certainty. If we survive that, we'll probably collide with an orthogonal clump of gas — turning the world itself into something like a giant Hurtler. Somewhere along the way, there will be gravitational disruption, maybe ripping us free from the sun completely — or maybe tossing us into it. And if none of these things sound sufficiently fearsome, the encounter might scramble our arrow of time completely, leaving us with no past and no future. The world will end as a lifeless mass of thermal fluctuations in a state of maximum entropy.
    Eusebio: So how can we survive that?
    Yalda: We can't.
  • Subspace or Hyperspace: Not referred to by name, but orthogonal space functions like hyperspace in many ways.
  • Suspended Animation: Uniquely inverted. Because of the universe's Minovsky Physics, reversed Time Dilation is in effect: Traveling fast enough will essentially cause Time to Stand Still from your perspective. The Generation Ship uses this to effectively suspend their entire Doomed Home Planet while they figure out a way to Save The World.
  • Techno Babble: The Book! Egan tones it down in the third book, though.
    Carla: Let's work with a stationary luxagen, to keep things simple. Then its energy-momentum vector points straight into our future. Suppose the luxagen field has a leftor of Up; its rightor will be the same, because Up divided by Up is Future. Suppose we rotate this luxagen in the horizontal plane: the North-East plane. Any such rotation will come from multiplying on the left and dividing on the right by a vector in the Future-Up plane — which will move our leftor and rightor from Up to some new position in the Future-Up plane. But the Future-Up plane is one we're treating as a single complex number, so if the luxagen field remains within that plane, it hasn't really undergone any physical change. And if you can rotate a luxagen in the horizontal plane without changing it, it must be vertically polarized.
  • The Singularity: Discussed. The entire point of the Peerless' journey is to have an indefinite amount of time to develop sufficiently advanced technology that will let them Save The World from the impending Cluster-Shattering Kaboom. Several characters wonder aloud just how much time that will actually be, and whether the returning travelers will bear any resemblance to their ancestors when they return.
  • Theme Twin Naming: Universally played straight, the only exceptions being solos. Cos are named with masculine and feminine forms of the same name, always ending in 'o' for males and 'a' for females. Examples include Carlo/Carla, Addo/Ada, Tamaro/Tamara, and so on.
  • Time Crash: Played literally, if bizarrely. Since spacetime is a closed loop in all dimensions, and time is fundamentally identical to space, clusters of matter that were thrown in all directions in time as well as space by the Big Bang occasionally collide with other clusters, many of which are traveling in different directions or even orthogonally to each other (again, in time as well as space), which means they literally have infinite velocity relative to each other. The plot is driven by one such impending collision, which threatens to annihilate the cluster in which the trilogy's cast originates.
  • Time Dilation: Justifiably inverted by the laws of physics as they apply in this universe. Traveling fast enough will cause you to be traveling through space without moving through time, which causes time to stop for the starting location. It drives the plot: By taking advantage of this phenomenon, the characters have all the time they need to figure out how to Save The World.
  • Title Drop: All over the place in each book, with the exception of The Clockwork Rocket, which is never stated in those words.
    • The "Eternal Flame" is a hypothetical inexhaustible energy source that could be used to fuel a Perpetual Motion Machine.
    • Any given object has an "Arrow of Time", a four-dimensional vector that describes its path through spacetime.
    • The trilogy's title is dropped far more frequently than any of the individual book titles; "Orthogonal", which is basically a fancy word for "perpendicular", is constantly used to refer to situations where something is traveling orthogonally through spacetime with respect to something else — "something else" usually being the Doomed Home Planet. note  The phrase "orthogonal matter", which is this universe's equivalent to Antimatter, is by far the most frequently used Title Drop.
  • Translation Convention: Presumably in constant effect, given the setting. Most noticeable in the lack of an obvious Alternative Number System despite virtually everything being based on powers of twelve.
  • Unto Us a Son and Daughter Are Born: With highly unusual exceptions, this trope is universally played straight with every birth. Justified by the biology of the species.
  • Viewers Are Geniuses: Par for Greg Egan's course, though he does make truly heroic efforts to avert it by explaining everything from the ground up.
  • Why Don't You Just Shoot Him?: The opinion of most of the Peerless' crew towards Yalda's humane treatment of Nino, the would-be saboteur during the launch.
  • Wrap Around: The universe is a four-dimensional sphere or possibly a torus, a donut-like shape. This is the explanation for why orthogonal matter from this universe's version of the Big Bang can be expected to occasionally collide. note 
  • The X of Y: The Arrows of Time.
  • You Already Changed The Past: Played with every which way from Sunday except straight — mostly just because everybody accepts that it would be impossible, so nobody tries.
    • Discussed: As mentioned on the main bullet above, as soon as the characters nail down the nature of spacetime, it's pretty much accepted that Time Travel, while possible (and surprisingly easy), cannot actually change anything.
    • Double Subversion: On Esilio, a planet with Merlin Sickness, the crew of the Surveyor blow up a rock. After the explosion, they find what looks like writing etched into a newly-exposed part of the rock, which seems to be a message from the ancestors (the inhabitants of the homeworld). Because of the planet's Merlin Sickness, the message must have been carved at some point in the future. The obvious assumption is that the message means the journey is successful; the Peerless makes it home, and at some point the ancestors visit Esilio and carve the message as encouragement to the travelers. But Ramiro decides that he wants to have a hand in fate, so he plans to go out and "carve" the message himself. Tarquinia prevents him from doing so — and he then realizes that she is going to carve the message. He spends most of the rest of the book under the impression that she did — only to discover after the climax that she tried to carve it, but no matter what she tried, the message stayed there, which means that she didn't do it either. The book ends with an implication that one of the characters in the final scene is the one to go to Esilio and carve the message.
    • Invoked: The Surveyor returns to the Peerless after a long absence to find that the inverted Time Capsule messaging system (which essentially lets people send email back in time) has been built, but also mysteriously stops working all at once at a known point in the future. But since no one actually knows what causes the disruption, the crew of the Surveyor realize that if nobody does anything, they are most likely consigning themselves to being hit by a meteor. On the other hand, if they attempt to sabotage the system, they are raising the probability that they will cause the disruption, which means no one will be harmed. In other words, they know they Can't Fight Fate since the universe is an absolutely Stable Time Loop, but if nobody tries to cause the disruption, then it's almost guaranteed that it's caused by a disaster such as a meteor strike; but as long as no one knows what causes the disruption and someone is trying to cause it, they are increasing the odds that the disruption has a harmless cause.

Old KingdomAustralian LiteratureA Phaery Named Phredde
Orion First EncounterScience Fiction LiteratureOryx and Crake

alternative title(s): The Clockwork Rocket; The Eternal Flame; The Arrows Of Time
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