Click the mouse, and the pro-cess is reversed. We are back to the original photo. Think about stop-action film, where we see a green shoot poke its way up from the ground, turn into a leafy stalk, produce a bud and blossom into a beautiful red rose. To see all that happen in a matter of seconds is to glimpse nature at work in a revealing way. Think about a high-rise building being demolished by dynamite so that the structure implodes upon itself and collapses into a cloud of dust.
Fascination is in the eye of the beholder.
The art-morphing program lets you pause at any point, heightening the fascination and giving you a sense of control in the creative process. May-be you don't want to push as far toward abstraction as van Gogh seems to have done. See for yourself. Instead of seeing the two endpoints, photo and work of art, you see stages in between. You see, for example, that van Gogh kept the eyes, nose and mouth virtually the same.