This is when a character is quite literally paper-thin, as if they were a paper cutout. This can also apply to normally three-dimensional characters who have been flattened
as a result of, say, a 300-pound weight being dropped on them
Not to be confused with Flat Character
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- Calvin once imagined he had become two-dimensional, allowing him to escape notice by turning sideways.
- Flat Man of the Great Lakes Avengers
- One robber / rapist crushed by a millstone in a story by Wilhelm Busch. Other than typical for this trope, he doesn't exactly revert.
- Two minor characters in Flaming Carrot got turned into "one-dimensional (sic) cartoon characters" by alien invaders, and folded up and stuffed under a rock. "Well, at least you can park in handicapped spaces now..."
- Flat Stanley is about a boy who is flattened by a falling bulletin board.
- Flatland has an entire paper-thin WORLD.
- In one scene in A Wrinkle in Time, Meg finds herself transported briefly into a two-dimensional world, where she can't breathe ("a paper doll cannot gasp"), and her heart can't pump blood properly ("a knife-like, sideways beat"). It was, Mrs. Which explains, an oversight on her part (apparently she and her two companions were perfectly comfortable there).
- In Pyramids, one of Ptaclusp's sons accidentally becomes this trope due to the twisting of dimensions by the grossly-oversized Great Pyramid. He also tends to drift horizontally at a steady rate, as the "fourth dimension" of Time now runs that way for him.
- The Beautiful Culpeppers is a children's book about a family of paper dolls owned by a little girl. They also have a 2-D paper house, which is tacked to a wall; they can go inside it, but we never get any details about what it's like in there.
- Grimm has the flat folk — people who were crushed under the falling Beanstalk but weren't killed by it, and were squashed into two-dimensionality. Well, physical two-dimensionality. Humans native to the Grimm Lands are always two-dimensional in the literary sense.
- This Whole Movie is built off this trope.
- "The Reddish Radish" animation from Homestar Runner.
- Mister Origami, a World-War II-era supervillain from the Global Guardians PBEM Universe, was paper-thin and could fold himself into many different paper animal shapes... and assumed the abilities of the animal in question.
- Kate Moss was portrayed this way on Family Guy.
- In Fosters Home For Imaginary Friends, the character Duchess appears like this whenever she turns around.
- Paper Doll Man of The Impossibles, who used his powers to steal top secret plans from the Pentagon, as well as money.
- The protagonist of Thin Pig makes better use of this than most, folding himself like origami into whatever form is necessary at the moment.
- From a show within a show on Futurama: "Father! The kidnappers cut off one of my dimensions!"
- Also, during The Beast With A Billion Backs, Fry and his date went on a 2D Tunnel of Love ride.
- On Ugly Americans, a wizard rival of Leonard's is trapped between dimensions, manifesting himself as a paper cutout.
- In the Classic Disney Short "Pluto's Judgement Day", one of the cats testifying against Pluto is a chubby kitten whom Pluto chased into the path of a steamroller. After testifying he turns around, revealing that he - and the balloon he's carrying - is flat as a pancake.
- During the first Jimmy Neutron/Fairly OddParents crossover special, when CG Jimmy is transported into Timmy's 2D world, he remarks that his depth is gone, and falls flat on the floor like a standee.
- Teri the bear, a character from The Amazing World of Gumball, is a crumpled paper cutout. She changes clothes and sometimes facial expression with a pencil.
- This Kaput And Zosky episode heavily features this.
- In The Problem Solverz episode "Zoo Cops", the characters are transported to another dimension, where everyone becomes this.
- Flatworms: They are what they say they are. Also: for a substantial proportion of them (the planarians, at minimum), cutting them up just gives you as many worms as pieces.
- Ediacaran biota: So far as we can tell from the limited fossil record, these were also thin. Note that some believe that some Ediacarans were (at minimum) proto-mollusks, proto-echinoderms, and proto-chordates, and were thus more substantial.
- Trichoplax adhaerens, sole member of the phylum Placozoa. These organisms are completely flat, composed of about three layers of cells.
- Plane trees
Horace: It's like we're cartoons! How horrible!