Figure-ground organisation en.wikipedia.org is how the eye splits a scene into an object and the field behind it, and it is one of the first perceptual skills a baby develops. Black type on white paper is the everyday case: the words are figure, the sheet is ground. The Danish psychologist Edgar Rubin described the mechanism in his doctoral thesis of 1915, and the vase that is also two faces en.wikipedia.org is the demonstration everybody has seen.


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