Making Up the Mind by Chris Frith

Author:Chris Frith
Language: eng
Format: mobi
Published: 0101-01-01T00:00:00+00:00

Figure 5.7 The domino illusion

The top domino has five convex spots and one concave spot. The bottom domino has two convex spots. In reality you are looking at a flat sheet of paper. The spots look concave or convex because of the shading. You expect the light to come from above so that shadow will be at the bottom of a convex spot and at the top of a concave spot. If you turn the page upside down, the concave spots become convex, and vice versa.

Figure 5.8 The hollow mask illusion

The Charlie Chaplin mask is rotated as we move from top left to bottom right. The face in the bottom right panel is concave since we are seeing the mask from the inside; we can’t help but see it as convex with the nose sticking out. In this case our knowledge that faces are convex overrides our knowledge about lighting and shadows.

Source: Professor Richard Gregory, Department of Experimental Psychology, University of Bristol.

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