SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Array of Necker cubes. A Necker cube is a wireframe drawing of a cube which could be interpreted as being orientated in two different ways. When there are two competing interpretations of an ambiguous image, the brain will often switch between them. This image takes that idea and draws an array of such cubes. They can either be seen as protruding from or intruding into the page.
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