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(A) Schematic of the diamond illusion showing the diamond shape oscillating horizontally behind three occluding stripes of the same color and luminance as the background. (B) Resultant perception is either “Local” with 4 lines moving up and down or (C). “Global” perception where the motion of the lines is grouped and they are seen as moving horizontally back and forth (redrawn from Fang et al., 2008).
