This demonstration lets you choose two photographs and gradually morph from one to the other using the "Morph" slider. The images are also increasingly blurred as you move to the middle morph position. If you start with the morph slider all the way to the left, then you'll clearly see the left image. If you slowly move the slider to 50%, then you might tend to see the left, rather than right, image. This is an example of perceptual hysteresis, the tendency to interpret something consistently with a recent interpretation.
Built by Robert Goldstone. Visit our Percepts and Concepts Laboratory