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Breathing Square
In the figure above, a green square is being obscured (or occluded) as it
rotates behind the gray squares. Although it appears to grow and shrink,
its size actually remains constant. The "breathing" effect is a
result of how our brain recognizes the boundaries of shapes over time, though
its exact cause is still unknown.
References
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[1]
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M. Shiffrar and M. Pavel, "Perception of rotation through apertures," Journal of Experimental Psychology: Human Perception and Performance, vol. 17, pp. 749–761, 1991.
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[2]
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N. Bruno N, "Breathing illusions and boundary formation in space-time," in From Fragments to Objects: Segmentation and Grouping in Vision (Advances in Psychology), Eds. T. F. Shipley and P. J. Kellman, pp. 531–556
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[3]
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M. Bach, "Breathing Square," Jun. 8, 2009. [Online]. Available: http://www.michaelbach.de/ot/mot_breathingSquare/index.html. [Accessed: Mar 13, 2010].
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