Master of illusion: Kokichi Sugihara's 'impossible' objects

Kokichi Sugihara, a mathematician, specializes in the impossible. He creates mind-bending physical objects that look and behave in incredible ways when seen from the right angle, such as marbles that roll uphill or circular pipes that look rectangular in a mirror.

Unlike traditional optical illusions, which short-circuit our brain's visual processing system, Sugihara's objects involve no visual trickery other than perspective.

"Historically, optical illusion has been a research topic in psychology. I introduced a mathematical approach to this topic, and thus can create new types of 3D optical illusions," he explained in an email interview.

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