Gradation
any gradual transition from one color to another or from one shape or volume to another. In drawing, shading created through the gradation of grays can be used to suggest three-dimensional form
Atmospheric Perspective
a visual phenomenon in which the atmospheric density progressively increases, hazing over the perceived world as one looks into its depth. Overall definition lessens, details fade, contrasts become muted and, ,in a landscape, a blue mist descends.
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