Time Travel can be difficult. Between the constant risk of creating a paradox or becoming trapped in another time, uncomfortable questions about causality and free will, and unexpected difficulty using verb tenses, this much is clear. But one of the difficulties rarely discussed is how to portray the act of traveling through time on-screen in a way that makes clear to the audience that time travel is, in fact, occurring. Sure, you could always just have someone from the present day enter a time machine then cut to them emerging in a scene that visibly takes place in a different era, but sometimes filmmakers want to portray the actual transition between the two in a way with a bit more pizazz. So what does time travel look like?
In a word, clocks.
Yes, you heard me right. Clocks. And not just your garden variety Spinning Clock Hands either. No, this is something entirely different. For some reason, the "space" you travel through when traveling through time looks like a surrealist dimension filled with giant, floating, semi-transparent clocks that fade in, drift vaguely towards the camera and then fade out again, ticking loudly all the while, only to be replaced by another, visibly different clock, all hovering upon a celestial backdrop resembling a starfield, hyperpsace, or in extreme cases, the Acid-Trip Dimension. This sequence rarely lasts more than about a minute, and can often resemble a faster-paced, more clock-oriented version of the opening sequence from The Twilight Zone. Less serious works will often include an obligatory cuckoo clock and/or kit-cat klock. Much more rarely, an Exploding Calendar may appear as well.
It is extremely rare for the characters to notice or comment on the clocks, and it usually isn't specified whether these clocks actually physically exist in the setting, or if they're just an elaborate form of Painting the Medium (though the latter is usually assumed). When the clocks are commented on, it's only for the purpose of Lampshade Hanging, and the hows and whys of the their collective existence are never addressed.
A bit of a Dead Horse Trope nowadays as it's considered too "goofy" for serious time travel stories, although it still shows up a fair amount in children's cartoons.
- Doraemon: Nobita's desk drawer is linked through some kind of hyperspace that, with a special vessel, you can use to travel through time. Said hyperspace has a lot of distorted clocks flying around.
- Superbook: The time travel back to biblical times had some clocks in it.
- The Black Moon arc of Sailor Moon R, which is based around time travel, does not feature this in-story, but the opening shows the main characters on an otherwise featuresless field on floating clocks and swinging pendulums.
- The Time Machine (1960) uses this as part of the opening credits.
- A variation on this trope occurs in some adaptations of Alice's Adventures in Wonderland, wherein Alice's fall into the rabbit hole is depicted with floating clocks everywhere — in these cases, she's not really traveling through time so much as she's traveling to another world.
- In Day of the Tentacle, when our heroes pass through the time tunnel a couple of items float on by, amongst them, a ticking clock.
- In The Legend of Zelda: Majora's Mask, the cutscene that follows the Song of Time, signifying the player's return to the beginning of the "Groundhog Day" Loop, shows Link falling down a spiral of the game's idiosyncratic spinning clock faces in a white void, as his disposable items fly away from him. Similar cutscenes, showing circles of clock faces surrounding Link, accompany the game's other time-manipulating songs.
- Touhou: Sakuya can temporarily freeze time, usually seen in animated works as clocks appearing and fading all over the screen.
- Parodied in Futurama episode "Roswell That Ends Well" when the ship literally fills up with clocks after falling through a time vortex.
- Phineas and Ferb have used the clocks and calendar pages variations in different episodes.
- The page picture comes from the The Simpsons "Treehouse of Horror V" story "Time and Punishment", where Homer accidentally travels to prehistoric times with a malfunctioning toaster.
- The Back to the Future episode "Einstein's Adventure" has a pair of crooks steal the DeLorean as a getaway car after a robbing, and accidentally travel to 1790, Sydney, Australia. When that happens, this is what they see for a few seconds through the windshield.
- Lampshaded and Justified in Milo Murphy's Law. The timestream has lots of clocks, which Dakota says was probably someone's idea of a joke. Later on, he ends up causing those clocks to be there in the first place by hitting a living pistachio with a bag of clocks from a dystopian future where said living pistachio plants overthrew humanity.