Optisch bedrog
donderdag 12 juni 2008 om 11:27
donderdag 12 juni 2008 om 11:50
donderdag 12 juni 2008 om 11:52
Stare at the center of the black dot for about 20 seconds. After a little while, you'll notice that the outside of the circle - the shaded area - starts to lose definition, and even becomes a solid color. Or, your eyes may notice that the shading shrinks and isn't even perceptible after a minute or so.
donderdag 12 juni 2008 om 11:56
