Accidental viewpoint

[1] In its uses in art and other visual illusions, the accidental viewpoint creates the perception of depth often on a two-dimensional surface[2] with the assistance of monocular cues.

In this case, viewing an object from an accidental viewpoint can result in altered perception in relation to mental prototypes.

[9] Two dimensional art objects generally use the assumption of a single viewpoint to give the illusion of depth (monocular depth cues), Hans Holbein's The Ambassadors (1533) is no different in that sense, however, Holbein also includes an anamorphic image of a skull which has a completely different view point in order to accurately view the object.

These took advantage of the accidental viewpoint by creating a scene that appeared to be three dimensional when viewed through a single hole in the box.

A modern representation of anamorphic images that makes use of an accidental viewpoint can be found in illusionistic street art.