One reversible figure can be seen either as a vase or as two profiles looking toward each other. This example illustrates the Gestalt principle of

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The principle of figure and ground explains how we can perceive an image in two different ways by distinguishing between the figure (object of focus) and the ground (background). In the vase/profiles illusion, we can either see a vase (figure) against a background, or two profiles (figures) facing each other with the vase becoming the background.

One Reversible Figure Can Be Seen Either as a Vase