Signedunsigned
FunctionUsed by Land for his experiments with color vision (Retinex theory). It was also most likely used in Land's famous lectures on the same topic.
Here is what Land says about the specific experiment related to the purple circle seen on the Mondrian (1983): "This experiment with the circle which we change from white to purple by changing the designators is of particular value for studying the question of the significance of the immediate surround—that is, of the influence on a given piece of paper of the papers that are its neighbors. The very design of the Mondrian is supposed to demonstrate that the immediate neighborhood has no special significance because a paper of a given type is the same color whatever its shape or size or position in the Mondrian."
Primary SourcesEdwin H. Land, "The Retinex Theory of Color Vision," Scientific American 237 (1977): 108-128.
Edwin H. Land, "Recent Advances in Retinex Theory and Some Implications for Cortical Computations: Color Vision and the Natural Image," Proceedings of the National Academy of Sciences of the United States of America 80 (1983): 5163-5169.
Edwin H. Land, "An Alternative Technique for the Computation of the Designator in the Retinex Theory of Color Vision," Proceedings of the National Academy of Sciences of the United States of America 83 (1986): 3078-3080.
ProvenanceThis object belonged to Edwin H. Land and came from the Rowland Institute, Harvard University. Gift of the Edwin H. Land Family.