Izvor: Wikipedija
Simultaneous Contrast Illusion. The horizontal grey bar is the same shade throughout.
Check this by covering everything except the bar.
Drawn in Photoshop by Adrian Pingstone in March 2005, and released to the public domain.
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This image has been released into the public domain by its author, Arpingstone. This applies worldwide.
In some countries this may not be legally possible; if so:
Arpingstone grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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