1) Optical illusion
Found on
https://www.crosswordclues.com/clue/necker-cube
The Necker cube is an optical illusion first published as a rhomboid in 1832 by Swiss crystallographer Louis Albert Necker. ==Ambiguity== The Necker cube is an ambiguous line drawing. 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 wh...
Found on
http://en.wikipedia.org/wiki/Necker_cube
(from the article `illusion`) Another example of ambiguity and object reversibility is the Necker cube ( Figure 2, example A), which may seem to flip-flop. Some studies have ...
Found on
http://www.britannica.com/eb/a-z/n/21
A classic example of an ambiguous figure. In 1832, the Swiss crystallographer Louis Necker noticed, while examining crystals, that three-dimensional objects can fluctuate in appearance. He published pictures of an unusual cube that appeared to assume different orientations as one looked at it. The e...
Found on
http://www.daviddarling.info/encyclopedia/N/Necker_cube.html
The Necker cube is a line drawing showing the 12 edges of a transparent cube, so that it can be seen alternately facing in two different directions. It is an example of an ambiguous figure.
Found on
http://www.probertencyclopaedia.com/browse/AN.HTM
No exact match found.
