Number of optical illusions : 67
[en]Verili by ste tomu že na obrázku sú len rovné čiary. Nie ? Skúste to pravítkom. Can you believe that on the picture you can see only straight lines ? No ? Check it with ruler if you have some.
Orbis Pictus
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Intelligence Inside

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

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