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

Colored pencil and graphite on paper

Graphite on paper

Mixed media

Graphite on paper

Brown crayon on paper

Mixed media

Graphite and red pencil on paper

Graphite on paper, mounted

Transparent and opaque watercolor and black ink on off-white handmade laid paper

Colored marker on paper

Black marker on paper

Black and red marker on paper