Number of optical illusions : 67
Ebbinghausova illusion is optical illusion of relative perception of sizes. This is most known version of this illusion where two identical circles are by side and one of them is surrounded by big and one by small circles. That is the reason why one of those identical circles seems to be bigger.
Orbis Pictus
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Meno

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Intelligence Inside

All improovments of intellect has got the base in free time.

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