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Enter an Optical Illusion

Oct 12, 2012 (Talk of the Nation) — Artist Julian Hoeber's "Demon Hill," now on view at the Harris Lieberman Gallery in New York City, is modelled after a roadside attraction called a "gravitational mystery spot" -- where water runs uphill and gravity doesn't behave as expected. Science Friday talked to cognitive scientist Michael Landy about what happens to our perceptual system inside the exhibition.

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