Examples tagged Optical Illusions
If you don't quite believe your eyes, you're not the only one! Yes, LaTeX can be used to create (and recreate) a huge variety of optical illusions, such as those shown in the examples below. Many make use of the excellent TikZ drawing package, and if you're looking for further inspiration you can find other TikZ examples in the gallery at TeXample.net.
Recent

Beautiful curved grid?
A variant and a combination of Hering's and Zöllner's illusion. The red grid is completely straight all the time.
Submitted as an answer to the Showcase of Optical Illusions question on TeX SX.
Click the Illusions tag below to see more!
OSjerick

The Grid
Submitted as an answer to the Showcase of Optical Illusions question on TeX SX.
Click the Illusions tag below to see more!
stalking isn't tolerated

Don't stare at this one for too long
Submitted as an answer to the Showcase of Optical Illusions question on TeX SX.
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Andrew Kepert

They are or not parallels?
The perpendicular lines that do not match row to row create an illusion of the lines between them being not parallel.
Submitted as an answer to the Showcase of Optical Illusions question on TeX SX.
Click the Illusions tag below to see more!
OSjerick

Ebbinghaus' illusion
Submitted as an answer to the Showcase of Optical Illusions question on TeX SX.
Click the Illusions tag below to see more!
cmhughes

Escher Illusions in LaTeX
A drawing in TikZ.
The first picture draws an impossible brick, which induces
an optical illusion similar to that triggered by Escher's
impossible cube.
The second picture draws a Penrose triangle, another similar
optical illusion.
Julien Cretel

Tribute to Monument Valley, Penrose and Escher
A tikz tribute to Monument Valley (the game by ustwogames) and Escher's impossible architecture with the Penrose triangle.
LianTze Lim

Optical illusion - Cylinder
Optical illusion: Do you look from the cylinder from the right or from the left?
Vicky