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The Fact
Whereas you almost certainly knew the original colors of the American flag, this one is a little bit more difficult to guess, thus demonstrating the remarkable power of this illusion. The combination of active and jaded cells in your eyes results in signals to the brain being misinterpreted, ultimately rendering a full-color image.
Wish I could have boomerang money! I spend it but they return. Wish I could have the "Boomerang" bank - I put my money in it and it brings'em back and so forth.