Study for "Fragments of Blue Neon Circles and Squares on a Pink Wall," University of Massachusetts, Amherst

Watercolor on ruled off-white wove paper

Black ink, graphite, and yellow chalk on off-white wove paper

Watercolor on off-white wove paper

Graphite on translucent vellum paper, the reverse printed with a grid

Black ink over graphite on off-white tracing paper

Graphite and ink on paper

Black ink and graphite on off-white wove paper

Black ball-point ink on cream wove paper; verso: same

Graphite on off-white wove paper prepared with pink watercolor

Watercolor over graphite on off-white wove paper

Graphite on off-white wove paper

Watercolor on cream wove paper