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Necker cube
First designed by L. A. Necker in 1832, the Necker cube is probably the most common example of an ambiguous form. It can be seen in two ways: occupying the front space or the back space. The orientation of the form switches spontaneously.
The ambiguity of the Necker cube is an example of how the brain can 'misread' visual signals. In this case, perception of an object is torn between two possibilities. When it is drawn without perspective, the image is ambiguous.
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