Thatcher Illusion (IMAGE)

Max-Planck-Gesellschaft

Thatcher Illusion

Caption

The Thatcher illusion: Local changes in facial features are hardly noticeable when the whole face is inverted (rotated 180°), but strikingly grotesque when the face is upright. In the Diagram two faces of an individual are presented. One picture is normal, while the seems grotesque by an upright presentation, but not if the faces are rotated 180°. Moreover, this illusion disappears if faces of another species are manipulated in the same way (see monkey faces).

Credit

Christoph Dahl

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