Diagram, Walls C and D of Wall Drawing #830 (Four Isometric Figures With Color Ink Washes Superimposed)

Black ink on off-white wove paper

Sketchbook with cardboard covers and spiral wire binding

Black ink on dark blue-green wove paper

Graphite on off-white wove paper

Black ink, charcoal, and watercolor pencil on cream laid paper, edges taped

Black ink on off-white wove paper

Black felt-tip ink on white wove paper

Charcoal on faded blue laid paper

Graphite on cream wove paper

Graphite and crayons on off-white tracing paper

Black ink on off-white wove paper (recto and verso)

Graphite on blue paper