How a curve ball fools the eye

05/15/2009 | Fast Company online

The curve ball is an unsettling reminder that even the brightest among us are susceptible to little tricks of the mind -- but there is a little comfort in understanding how the trick works. While it's possible to explain it away with an artful discussion of topspin, a visual aid is really necessary to grasp this wonderfully weird effect. A demonstration of the curve ball effect leads the field in the Neural Correlate Society's fifth annual top optical illusions contest.

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