Untitled (sketch by Piene's daughter [Chloe], left page); Untitled (sketch by Piene's daughter [Chloe] right page)

Blue pen on notecard, black pen on postal receipt, adhesive, and black pen on paper

Graphite on paper

Black ink on off-white wove paper

Graphite on paper

Colored marker on paper

Graphite on paper

Graphite on paper

Graphite and colored pencil on paper

Mixed media

Paper

Paper

Graphite, and transparent and opaque watercolor on white wove paper