Untitled (front endpaper, left page); Untitled (Piene signature, right page)

Graphite on paper

Graphite on paper

Colored crayons on paper

Charcoal on off-white wove paper

Graphite on paper

Graphite on cream wove paper

Ink and wash on paper

Black crayon on paper

Colored marker and green pen on paper

Graphite on paper

Opaque watercolor and graphite on paper

Graphite on paper