These sketchbook pages explore three different ways of creating the illusion of volume and mass with 2D media. Four sketches demonstrate creating volume and depth by using cross-contour lines to reveal not just outlines of a form, but the various shapes that make up its surface. Another four sketches show volume with dramatic light and dark contrasts, gotten by first toning the paper to a medium gray with charcoal, then pulling out lights with an eraser, and finishing by developing the shadows. The last four show form and suggest volume by developing only the negative space around an object, in my case a dining chair positioned at different angles.
You can see in the third set of sketches where I messed up pretty dramatically on one chair area and had to erase the best I could. Result: ghost chair!