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Stroboscopic Alternative Motion (SAM)
The figure above contains four circles that flicker on and off, but it looks as though
they are shifting around instead. Depending on how you look at them, they
may appear to shift horizontally, vertically, or even in a clockwise or counterclockwise
rotation. The buttons below the figure can help you see them shift in a different way.
References
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[1]
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P. von Schiller, "Stoboskopische Alternativbewegungen" ["Stroboscopic alternative motion"], Psychologische Forschung, vol. 17, pp. 179–214, 1933.
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[2]
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M. Bach, "Stroboscopic Alternative Motion (SAM)," Jun. 28, 2002. [Online]. Available: http://www.michaelbach.de/ot/mot_sam/index.html. [Accessed: Mar 10, 2010].
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