Detail of Pythagoras, Campanile, Florence Cathedral, Florence, Italy

Collage of fern leaves on red wove paper

Red, black, brown and white conté crayon on ivory tracing paper

Watercolor on cream wove paper

Graphite on paper

Watercolor and white gouache on off-white wove paper

Black ink and white-gray gouache on grayish-white textured wove paper

Charcoal on off-white laid paper

Graphite on paper

Charcoal and watercolor on off-white laid paper

Graphite on cream wove paper

Charcoal, oil stick, acrylic, and Liquid Paper on white wove paper

Graphite on darkened off-white wove paper