Factory and Office Building for Werkbund Exhibition, Cologne, 1914: Perspective

Black crayon on paper

Graphite on paper

Graphite on paper

Black crayon on paper

Watercolor, black ink, and black crayon on cream wove paper

Black crayon on paper

Graphite and crayon on paper

Graphite on paper

Black crayon on paper

Graphite and green crayon on paper

Graphite on paper

Graphite on paper