[en]Number of optical illusions : 67
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(© 2011 Erica Dixon, Arthur Shapiro & Kai Hamburger)
Luminance levels of four disks modulate in time. The top two disks become white when the bottom two disks become black, and viceversa. When placed against a split background, the disks group together along the diagonals. This grouping pattern follows the contrasts of the disks relative to their backgrounds.
[en]No discussion. You can be the first.
Meno

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Intelligence Inside

[en]All improovments of intellect have got backround in free time.

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