Untitled (drawing by Piene's daughter, left page); Untitled (bleed-through of following page with title for drawing, right page)

Black and red chalk and graphite on paper

Colored marker on paper

Colored marker on paper

Black crayon on paper

Black crayon on paper

Graphite on paper

Black marker on paper

Black marker on paper

Graphite on paper, mounted

Black crayon on paper, mounted

Black crayon on paper

Ink and watercolor on paper