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

Black crayon on paper

Graphite and colored crayons on paper

Graphite on paper

Black crayon on paper

Black crayon on paper

Graphite on paper

Black, yellow and blue crayon on paper

Black crayon on paper

Colored marker and blue pen on paper

Graphite on paper

Colored crayons on paper

Black ink on paper