The local-tone is the intrinsic value of a thing - excluding any effects of light. The local-tone of a common pearl is very nearly white; that of a lump of coal, nearly black. Votes: 3
The inherent lightness or darkness of a form - its local-tone - is a given quality of all forms. It is affected by, but separate from, the light and dark areas that result from light falling on forms. Votes: 2
Value gives the artist the means of showing subtle changes in a form's surface-state, and it helps clarify the relative distance between forms. Votes: 0
Value, whether the result of massed lines, broad strokes, or washes, is the necessary and only tool for modelling form with light. Votes: 0
Perspective should be learned - and then forgotten. The residue - a sensitivity to perspective - helps perception, varying with each individual and determined by his responsive needs. Votes: 0