International Academy of Philosophy, Erlangen, 1924: Scheme B: section through lecture hall

Charcoal on paper

Graphite on paper

Brown crayon on paper

Graphite on paper, mounted

Graphite on off-white wove paper

Blue crayon on paper

Graphite on paper, mounted

Black marker on paper

Graphite on paper

Black and colored crayons on paper; black crayon on paper

Graphite on paper

Graphite on cream wove paper