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
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.
1. a clearly defined area around a positive shape or form 2. a shape created through the absence of an object rather than through the presence of an object
1. a line that is suggested by the positions of shape or objects within a design. 2. a line that is suggested by movement or by a gesture rather than being physically drawn or constructed.