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Necker Cubes. The cube on the left is drawn without perspective and flips between alternative cube shapes. The cube on the right is drawn in perspective, and flips between a cube and a truncated pyramid. Based on parts of Fig. 10.20 in (19).

Necker Cubes. The cube on the left is drawn without perspective and flips between alternative cube shapes. The cube on the right is drawn in perspective, and flips between a cube and a truncated pyramid. Based on parts of Fig. 10.20 in (19).

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Figure 1. The solid image microscope. (a) Early version in which the...
Figure 2. Necker Cubes. The cube on the left is drawn without...
Figure 3. The hollow mask illusion. The masks on the left are normal...
Figure 4. The Kanisza triangle. The non-existent triangle, inferred...
+2 Figure 5. Ponzo and Orbison illusions. When the background lines signal...
Richard Langton Gregory. 24 July 1923—17 May 2010
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  • Mar 2018
Richard Gregory was a pioneer of cognitive psychology. Much of his scientific work involved the development and interpretation of visual illusions, which he used as a tool to work out the perceptual mechanisms involved in the way that the visual world is normally perceived. He was also an inventor, developing a technique for viewing microscopic obj...
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Context 1
... used ambiguous figures, such as the Necker Cube (Figure 2a), to make the point that, when there is nothing to decide between equally probable hypotheses, the perceptual system alternates between them. With the Necker Cube there is no evidence to indicate which large square is the front and which the back of the cube, and the two interpretations swap over every few seconds. ...
Context 2
... the Necker Cube there is no evidence to indicate which large square is the front and which the back of the cube, and the two interpretations swap over every few seconds. Interestingly, if the cube is drawn in perspective (Figure 2b) one square is now larger than the other, so there is evidence that one face is in front of the other, provided the assumption is made that the figure remains a cube. When the percept flips, so that the smaller square is in front, the perceived shape changes from a cube to a truncated pyramid. ...
Context 3
... concluded that there were four basic kinds: ambiguities, distortions, paradoxes and fictions. Ambiguities include figures such as the Necker Cube (Figure 2) or the hollow face (Figure 3), where there are two or more possible interpretations. Simple figures such as ellipses may indeed be ellipses, but may also be circles seen in slanting perspective. ...
Context 4
... used ambiguous figures, such as the Necker Cube (Figure 2a), to make the point that, when there is nothing to decide between equally probable hypotheses, the perceptual system alternates between them. With the Necker Cube there is no evidence to indicate which large square is the front and which the back of the cube, and the two interpretations swap over every few seconds. ...
Context 5
... the Necker Cube there is no evidence to indicate which large square is the front and which the back of the cube, and the two interpretations swap over every few seconds. Interestingly, if the cube is drawn in perspective (Figure 2b) one square is now larger than the other, so there is evidence that one face is in front of the other, provided the assumption is made that the figure remains a cube. When the percept flips, so that the smaller square is in front, the perceived shape changes from a cube to a truncated pyramid. ...
Context 6
... concluded that there were four basic kinds: ambiguities, distortions, paradoxes and fictions. Ambiguities include figures such as the Necker Cube (Figure 2) or the hollow face (Figure 3), where there are two or more possible interpretations. Simple figures such as ellipses may indeed be ellipses, but may also be circles seen in slanting perspective. ...