Sketchbook: Partial Manuscript for "Otto Piene: Werkverzeichnis der Druckgrafik 1960-76"

Colored marker and black pen on paper

Black crayon on paper

Graphite on paper

Graphite on paper

Graphite on paper

Black ink on paper

Black and orange marker on paper

Paint samples, blue pen, and adhesive on paper

Graphite on paper

Opaque watercolor on paper

Black marker on paper

Black ink on cream wove paper