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Try to follow the animation, then look in another direction, then again on the screen. Can you see an inversion in the pattern: from horizontal to vertical?!
[from: http://pages.slc.edu/~ebj/sight_mind/motion/Nakayama/1.35.html ]
<<The stimulus Nakayama et al used to measure the extent of amodally completed surfaces. The motion is perceived as vertical because of the closer vertical proximity of the moving black rectangles. They estimated the extent of the completed surfaces by finding the horizontal separation required to make the perception bistable, as in the simple Ramachandran-Anstis bistable competitive motion paradigm.>>