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#4 : Bulging Square?



Does the square really bulge? Click the image to see - JavaScript Required.

#4 : Bulging Square?

Attribution: Blaine20, CC BY-SA 4.0, via Wikimedia Commons. 



All Illusions



Rabbit / Duck?
Shadow Illusion
Bulging Square?
Impossible Triangle?
Parallel Cafe Wall Lines?
Apple Illusion

I'm planning on adding 2-3 illusions each month.