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

Graphite on paper

Acrylic paint on paper

Graphite on off-white wove paper; verso: charcoal

Transparent and opaque watercolor and graphite on white wove paper

Black ink and charcoal on cream laid paper

Graphite on paper

Dark brown ink on white wove paper

Graphite on paper

Graphite and collage elements on paper

Black crayon on paper

Hammered marks on blue transfer paper

Black ink and gouache on cream wove paper