"Originally trained in Gestalt psychology, with its emphasis on the perception of forms as organized wholes, he was one of the first investigators to apply its principles to the study of art of all kinds." --Today's New York Times

From the Wikipedia article on Gestalt psychology prior to its modification on May 31, 2007:

"Emergence, reification, multistability, and invariance are not separable modules to be modeled individually, but they are different aspects of a single unified dynamic mechanism.

For a mathematical example of such a mechanism using the cubes of psychologists' block design tests, see Block Designs in Art and Mathematics and The Kaleidoscope Puzzle."

The second paragraph of the above passage refers to my own work.

Some Gestalt-related work of Arnheim: