Try this simple experiment, which contains a key to how color can be used in creating a drawing's structure.
With a black pencil, draw the schematic shown of a circle within a rectangle, and the rectangle divided lengthwise by a line. The elements of this little drawing appear flat, with no feeling of dimensionality. Still using a black pencil, add an illusion of form and space by diagonally hatching the area above the bisecting "horizon" line, and by adding some light horizontal strokes to symbolize a lighter foreground. Add some additional hatching lines as a core shadow to the circle, making it seem a sphere. With these changes in value you have constructed a linear drawing that contains a credible illusion of form and space.
Adding a few appealing colors to this drawing might now seem the logical way to convert to color—and it is often the kind of approach made to color drawing. However, the only truly satisfactory way to accomplish structure in drawing with color is to begin with color. To see how color creates form by itself, outline the rectangle of the schematic with a 922 scarlet red pencil (or combined with a 901 indigo blue). Draw a circle with a 903 true blue and the bisecting line with a 922 scarlet red. These colors—chosen for their particular abilities to advance and recede—will serve as the basis for creating form and structure.
Because the background above the horizon is meant to recede, a 901 indigo blue (a cool hue of low intensity) is a good choice for the diagonal hatching in this area. To bring the foreground forward, begin with a 922 scarlet red near the horizon, warming it with 918 orange as it comes forward, and ending with a 916 canary yellow where it is to read as farthest forward.
Because color also has the ability to suggest form by its shifts in hue under different degrees of illumination, this sphere, which is blue, ought to appear more green where it is most illuminated, and nearer violet where it is least illuminated. To utilize this aspect of color, draw the sphere's core shadow this time with a 903 true blue crosshatched with its adjacent hue of 932 violet. Further restate the bottom of the sphere with a 932 violet, and the top contour—where most light hits it—with the blue's other adjacent, a 910 true green.
You now have a second drawing that contains an illusion of form and space. But note how this second structural illusion, built with a combination of line and color, seems to more clearly state its feeling of form and depth, and also to evoke its own mood.
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