411 REFERENCE · Wiktionary
Necker cube
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
thumb|The Necker cube.
Etymology
The Necker cube was first published as a rhomboid in 1832 by Louis Albert Necker.
Noun
An optical illusion consisting of a wireframe drawing of a cube, where a given face may be perceived as being either on the front or the back of the cube.
See also
en Penrose triangle
en eponyms
en Optical illusions