Visual Illusions - Perceptual Ambiguity

The horizontal lines are both parallel and straight in the diagram below.

The objects in the diagram below are geometrically perfect. The square is made entirely of right angles, while the circle is round and not oblong as it appears.

All of the lines are parallel

Perceived length can differ from actual length, as illustrated by the classic Muller-Lyer illusion. The two horizontal lines are identical in length but the one on the left appears longer than the one on the right(Kandel, 1991).

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Dave Crow

Last updated: Nov28,1995: Dave Crow