Rubin's vase is a famous set of ambiguous or bi-stable (i.e., reversing) two-dimensional forms developed around 1915 by the Danish psychologist Edgar Rubin. We see the image: either as two white faces looking at each other in front of a black background,

- Image ID: G15TGJ
Rubin's vase is a famous set of ambiguous or bi-stable (i.e., reversing) two-dimensional forms developed around 1915 by the Danish psychologist Edgar Rubin. We see the image: either as two white faces looking at each other in front of a black background,
Science History Images / Alamy Stock Photo
Image ID: G15TGJ
Rubin's vase is a famous set of ambiguous or bi-stable (i.e., reversing) two-dimensional forms developed around 1915 by the Danish psychologist Edgar Rubin. We see the image: either as two white faces looking at each other in front of a black background, or as a black vase on a white background. The shape of the image depends on the side of the line we chose as part of the figure. This is important because the human brain has in general just one object in the field of perception and the other objects go into the background of perception. The reversal you perceive may happen because you shift your attention from one contour to another or from one color to another.