Stereokinetic phenomena are visual illusions of three-dimensional objects produced by various drawings stuck on a platform rotating on the frontal plane. They are of theoretical interest because the phenomena cannot be explained by a “rigidity assumption” like other structures from motion, but they can be explained by a Gestalt general principle that minimizes speed differences. Other unique factors included (a) they do not appear to rotate but describe a circular translation (a movement analogous to that of a hand drawing a circle with the thumb oriented to the left and all its points moving at the same speed); (b) they appear to be three-dimensional and solid; and (c) they appear of a well-defined length in depth. This chapter discusses stereokinetic phenomena, including the related principles regarding the rigidity assumption, speed minimum difference, minimum principle, rotating figures, three-dimensional illusions, rotating circles, rotating ellipses, and rotating bar.
Keywords: stereokinetic phenomena, structure from motion, rigidity assumption, speed minimum difference, minimum principle, rotating figures, three-dimensional illusions, rotating circles, rotating ellipses, rotating bar
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