The Role of Brightness Differences in Figure-Ground - Is Darker Figure. Alan, M., M. & Mistrick, T., A. Cartographic Journal, 1992.
The Role of Brightness Differences in Figure-Ground - Is Darker Figure [pdf]Website  abstract   bibtex   
Separating figure from ground is a fundamental map design objective in all but the simplest maps. Psychological principles underlying the figure-ground relationship are presented as a basis from which to examine the role of value contrast in establishing figure-ground separation between land and water on maps. An experiment is described that comes to the conclusion that neither light nor dark areas are seen as figure if all other things are equal, and that knowledge of which area is land does not dictate that land will be seen as figure. Implication of results for development of exploratory visualisation tools are considered.

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