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10 most difficult optical il­lu­sions riddles

A list of optical illusions related questions that are most often answered incorrectly
Optical illusions quiz
Which continent is that?
Australia
Asia
Africa
North America
This map of Africa is rotated so the continent shape resembles Australia.
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Very interesting!
geography of Australia riddles
Which shape is larger?
A
B
None of them
Both are larger
Both shapes are the same, but the bottom one is placed more to the right. This is however difficult to notice. It is known as Jastrow Illusion.
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Very interesting!
geometry riddles
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Optical illusions quiz