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

Graphite on cream laid paper; verso: graphite

Colored crayons on paper and mounted

Graphite on paper

Graphite and colored crayons on paper

Colored marker and black pen on paper

Graphite and red pencil on paper

Opaque watercolor and adhesive on paper

Watercolor on paper

Graphite on paper

Black crayon on paper

Black marker and blue ink on legal ruled paper and adhesive on paper

Graphite on paper