While approaching the Rotating Tilted Line Illusion (Gori & Hamburger, in press), the radial lines appear to rotate in counter-clockwise direction,
whereas when receding from it, they appear to rotate clockwise.
It presumably represents the simplest form of apparent motion illusions where self-motion is required for perceiving circular rotation.
This illusion has first been published in: Martinez-Conde, S., Pérez, M. & Martinez, L. (2005). Flipar en Colores. Quo, July 2005, 110-115.
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