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Dynamic Background School of Fish

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Guillaume
Riesen
This is based on Akiyoshi Kitaoka's School of Fish illusion: http://www.psy.ritsumei.ac.jp/~akitaoka/movinschooloffish01.jpg You can modulate the luminance of the background with the Y position of the mouse, and invert the luminance by clicking. Position the mouse near the top or bottom of the screen and click repeatedly to induce strong transient motion. It seems that adjusting the luminance within the range which exists within the fish themselves gives the strongest effect.
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