Suppose that a psychologist loans you an art book and says that the book includes some interesting ambiguous figure-ground pictures. You should expect to see

a. a random arrangement of black-and-white figures.
b. a photo of real-life figures, rather than black-and-white shapes.
c. a picture in which a specific region is the central figure one moment, but this region becomes the background the next moment.
d. a picture that has at least two subjective contours.

Ans: c