Ambiguous Garage Roof

2015 Second prize
Kokichi Sugihara” “Ambiguous Garage Roof”. Meiji University (Japan)

A round roof of a garage changes its appearance to a corrugated roof when it is reflected in a mirror. The actual shape is neither round nor corrugated. This illusory solid was discovered by combining two observations. One is a mathematical observation that a single image does not covey depth information, and the other is a psychological observation that the human brains like right angles in interpreting an image. Indeed we are apt to interpret the edge curve of the roof as an intersection of a roof with a plane perpendicular to the axis of the roof.

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