Two kinds of planar gradation can be distinguished:
1. Planar Rotation. This indicates the gradual change of direction of the unit forms. A shape can be rotated without diversion from the picture plane.
2. Planar Progression. This indicates the gradual change of position of the unit forms within the structural subdivision of a design. The unit forms can ascend or descend, or shift from one corner of the subdivisions to another, in a sequence of regular, gradual movements.
[Wong, Wucius. Principals of Two-Dimensional Design. New York: Van Nostrand Reinhold Company, 1972.]
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