In this illusion, a java applet is run in which a set of lines moves upward for ~15 to 30 seconds. Stare continuously at the center of the pattern of moving lines and then when the photograph of Niagara Falls appears, see if you see the water flowing. This illusion works on my Pentium computer but not on my older 486 DX2 66 MHz computer because it is too slow.
The photograph of Niagara was taken by Abdul Munem Khan.
Click here to try out the illusion.
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