What perceptual principle allows you to perceive the image as either two faces or a vase?

Question

Quizplus · Accepted Answer

The perceptual principle at work here is figure-ground reversal, which allows the image to be perceived as either two faces or a vase depending on the viewer's perception of the foreground and background. This principle involves the ability to separate an image into a figure (the main object of focus) and a ground (the background on which the figure rests). In this case, the negative space of the image can be seen as either the vase or the faces, depending on which is perceived as the figure and which is perceived as the ground.

What Perceptual Principle Allows You to Perceive the Image as Either