Halle Civic Center, Museum, and Stadium, Halle, 1927-1928: Civic center, acoustical study: section, 1:200

Blue pen on paper

Graphite

Graphite on paper

Graphite on paper

Graphite and colored pencil on paper

Graphite and ink on paper

Graphite on paper

Paper

Graphite on paper

Oil over graphite on translucent paper, mounted to board

Black ink and charcoal on cream laid paper

Oil and shellac on gelatin silver prints mounted to cardboard