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Here are some of our favorite optical illusions:

1) The 3-D Effect on a Flat Screen

Stare at the center blue disk and move your head back and forth, and your brain will tell you that the out of focus center is on a different 3-D plane than the outer rectangle. But it can't be, can it? --- your monitor is only 2-D

Stare at the center blue disk and move your head back and forth, and your brain will tell you that the ripples are on a different 3-D plane than the center sphere. But it can't be, can it? --- your monitor is only 2-D

Another version of the first illusion in this group.. Stare at the center circle and move your head back and forth, and your brain will tell you that the inner circle is on a different 3-D plane than the outer rectangle. But it can't be, can it? --- your monitor is only 2-D

2) The Dots that aren't there

Stare anywhere, and you will see black round dots in the little white circles that are not really there. Want to have fun? Stare at one place and try to "count" the black dots with your mind.

3) Right vs. Left Brain Interference

OK. Five simple lines, 3 words each line. Try to say the color each word is printed in as fast as you can, and like it or not you'll say the printed word and not the color at least once.

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