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Necker cube

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Necker cube and impossible cube

Necker cube on the left, impossible cube on the right.

The effect is interesting because each part of the picture is ambiguous by itself, yet the human visual system picks an interpretation of each part that makes the whole consistent. The Necker Cube is sometimes used to test computer models of the human visual system to see if they can arrive at consistent interpretations of the image the same way humans do.

Humans do not usually see an inconsistent interpretation of the cube. A cube whose edges cross in an inconsistent way is called an impossible object, specifically an impossible cube.



The Necker cube can shed light on the human visual system. Sidney Bradford, blind from birth but regaining his sight following an operation at age 52, did not perceive the ambiguity that normally sighted observers do.

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The Necker Cube is used in epistemology (the study of knowledge) and provides a counter-attack against naïve realism. Naive realism (aka direct or common-sense realism) states that the way we perceive the world is the way the world actually is.

The Necker cube seems to disprove this claim: we see a cube, but really, there is no cube there at all: only a two-dimensional drawing of twelve lines. We see something which is not really there, thus (allegedly) disproving naïve realism. This criticism of naive realism supports representative realism.

External linksEdit


Einhäuser, Wolfgang, Martin, Kevan A. C. & König, Peter (2004) Are switches in perception of the Necker cube related to eye position?. European Journal of Neuroscience 20 (10), de Neckernl:Necker-kubus zh:奈克方塊


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