English: The Spinning Dancer is a kinetic, bistableoptical illusion resembling a pirouetting female dancer. Some observers initially see the figure as spinning clockwise and some counterclockwise. Additionally, some may see the figure suddenly spin in the opposite direction. The illusion derives from an inherent ambiguity from the lack of visual cues for depth. There are other optical illusions that originate from the same or similar kind of visual ambiguity, such as the Necker cube.
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Zoomed in on a small detail (white contour line). The original can be viewed here: Spinning Dancer.gif: . Modifications made by Ceinturion.
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