Two common kinds of shape gradation are suggested:
1. Union or Subtraction. This indicates the gradual change of positions of sub-unit-forms which make up the unit forms proper by union or subtraction. The shape and size of each of the sub-unit-forms may also undergo gradual transformations at the same time.
2. Tension or Compression. This indicates the gradual change of shape of unit forms by internal or external forces. The shape appears as if it is elastic, easily affected by any slight push or pull.
[Wong, Wucius. Principals of Two-Dimensional Design. New York: Van Nostrand Reinhold Company, 1972.]
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