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#180 : Top Or Bottom?

Illusion
 

Random Illusion

#180  -  Show Answer  -  Print Illusion

Are you looking at the top or the bottom of the glass? This illusion appeared in Popular Science Monthly in 1899.

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Optical illusions are often described as visual images that differ from reality - the eyes and brain 'see' something that doesn't quite match the physical measurement of the image. Optical illusions can work in various ways, they can be images that are different from the objects that make them, they can be ones that come from the effects on the eyes and brain through excessive stimulation, and others where the eye and brain make unconscious inferences.



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