Using forms in gradation can be positioned according to a regular repetition structure with gradual variations. Unit forms can also be positioned with increasing or decreasing density.
[It is a much stricter kind of discipline than similarity within a design . . . . ] It demands not just gradual change, but gradual change in an orderly way. It generates optical illusion and creates a sense of progression, which normally leads to a climax or series of climaxes.
Gradation is a daily visual experience. Things that are close to us appear large and those that are far from us appear small. If we look at a tall building with a facade of regular window patterns from a very low angle, the change in size of the windows suggests a law of gradation.
[Wong, Wucius. Principals of Two-Dimensional Design. New York: Van Nostrand Reinhold Company, 1972.]
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