Rings appear to rotate clockwise constantly, though their positions do not change. (a demo of "phenomenal phenomena" called by Gregory and Heard (1983))pic.twitter.com/y5mXSGvl4d
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Gregory, R. L. & Heard, P. F. (1983). Visual dissociations of movement, position, and stereo depth. Quarterly Journal of Experimental Psychology, A, 35, 217-237.
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