I've got a great illusion for you today. You will see above a grid with two black and white blocks moving from right to left and back again. It appears that the blocks are not moving smoothly, but stepping from one line to the next. This is only an illusion. If you press the add words button at the bottom you will see that when we put the optical spy words on the blocks they now flow smoothly back and forth. But the movement of the blocks hasn't changed at all, it just overrides the illusion. Press remove words button to reset.
Optical Illusion Website
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