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Louis, Swiss physicist and mathematician, 1730-1804.
Necker cube - line drawing in which 12 angles of the cube are visible.
Perspective drawing of the outline of a cube that can induce two perceptions, either a three-dimensional cube orientated upward or a three-dimensional cube orientated downward (Fig. N1). SeeBlivet figure; Rubin's vase; Schroeder's staircase.