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

Black crayon on paper

Black crayon on paper

Black crayon on paper

Watercolor on off-white wove paper

Graphite on paper

Graphite on paper and mounted

Black marker on paper

Black and blue crayon on paper

Graphite, colored pencil, and colored crayons on paper

Black, orange, and violet crayon on paper

Graphite on paper

Graphite on paper