Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Long section through skylight over pool (1/2" and 3" = 1'-0")

Black ink, graphite, and red and blue pencil on off-white wove paper

Charcoal on off-white laid paper

Graphite on off-white wove paper

Graphite on off-white wove paper

Graphite on off-white wove paper

Ink and graphite sketches on commercially lined hole-punched paper

Black crayon on paper

Graphite, conté crayon and found fiber on handmade paper

Black ink, graphite, and yellow chalk on off-white wove paper; verso: black ink

Watercolor and graphite on cream wove paper

Watercolor and white gouache on cream wove paper

Graphite on cream wove paper, mounted on heavy cream wove paper