# Necker cube

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## Necker,

Louis, Swiss physicist and mathematician, 1730-1804.
Necker cube - line drawing in which 12 angles of the cube are visible.

## Necker cube

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). See Blivet figure; Rubin's vase; Schroeder's staircase.
Fig. N1 Necker cube
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References in periodicals archive ?
Turning now to Figure 1b, inspection readily discloses that both of the perspectives shown in Figure 1a are encompassed in the body of the Necker cube. This creates visual ambiguity.
In Figure 2b, I've added some volume to the Necker cube, fleshed it out a bit.
The Necker Cube itself (Fig 1) is 2 cm horizontally and vertically and 1 cm diagonally.
The Necker Cube Test is a simple, two-part assessment easily adaptable to the clinical setting.
The Necker cube is slightly different from my goose-shaped ashtray in that I can, almost at will, "flip" the cube and see it the other way.
This lesson is useful enough when looking at Necker cubes and op art, but it becomes crucial when we observe the social world around us.
After observing how quickly the Necker cube nips state and knowing how slow the underlying human computing elements are, it seems unlikely that a sequential program on such a slow device could do the job.
There does not appear to be any alternative way to describe the Necker cube phenomenon that is nearly as clear and concise as Figure 1.
The Necker Cube demonstration in fact was motivated by this very fact (and this was done in the 1980's).
When my perception, or perspective, of the Necker Cube changes it is disorienting.
Made from a geometric hexagonal pattern of necker cubes, it was very reminiscent of the honeycomb.
Like Necker cubes, which offer multiple perspectives even while their visual properties mutually cancel each other out, Hasselknippe's objects both demand and displace direct experience.

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