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 cubeenlarge picture
Fig. N1 Necker cube
References in periodicals archive ?
Cardinal Ercole Gonzaga is an attractive but ambiguous figure in sixteenth-century Italian religious history.
This wonderfully ambiguous figure became a Rorschach test for analysts, who rushed to their squawk boxes with verdicts that were all over the place.
The importance of feminine gentleness in this period is underestimated: Valeria, in The Basset Table, is admittedly an ambiguous figure, but if she were intended to be as attractive as Kreis-Schinck claims, Centlivre would not have given such dramatic prominence to her penchant for dissection (see p.
The clever young man--Enquist writes wonderfully wittily and well about Lewi's sheer intellectual ability--was driven by genuine conviction always, but develops into a deeply ambiguous figure, part gentle father of "The Movement," part ruthless master of Realpolitik.
The issue for Aronoff becomes whether such a morally ambivalent and politically ambiguous figure as Smiley can be appreciated as a hero--or even a human.
An ambiguous figure, Judith has served symbolic purposes for such diverse groups as Protestant partisans during the wars of re ligion, aristocratic women supporters of the Protestant reformation, opponents of the French Revolution, Nazi mythmakers, filmmakers obsessed with gun-toting girls, freedom fighters, partisans in the former Yugoslavia and may others.
Hence, Medb, the great queen of Irish saga, represents the achievements of real women rather than the satirical ambiguous figure every other Celticist takes her to be.
This ambiguous figure does not indicate whether a firm is healthy or failing.
Farriol, despite his repeated speeches to Andreu about maintaining ideals, is an ambiguous figure at best.
Most essays end with a discussion of Spinoza, an ambiguous figure in two ways.
An ambiguous figure, the latro crossed boundaries, just as monks, hermits and anchorites would do.