Mass is the where as depth is the a. (1) effect or degree of bulk, density, or weight a 2-dimensional form; (2) area of dark created when an object blocks light b. (1) effect or degree of bulk, density, or weight a 3-dimensional form; (2) apparent distance from front to back in a piece of artwork c. (1) effect or degree of bulk, density, or weight a 3-dimensional form; (2) distance or area between, around, above, below, and within objects d. 1) apparent distance from front to back in a piece of artwork; (2) effect or degree of bulk, density, or weight a 2-dimensional form