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

Black marker on paper

Watercolor on paper

Graphite on ivory laid paper; verso: graphite

Pen and ink on paper

Ink on paper

Graphite and colored crayons on paper

Colored crayons on paper and mounted

Colored marker and blue pen on paper

Graphite and watercolor on paper

Graphite and ink on paper

Black crayon on paper and mounted

Black pen and black marker on paper