Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Numerals - light signals (full size)

Black ink, graphite, and watercolor on cream wove paper

Graphite on off-white wove paper

Red and black conté crayon on ivory tracing paper

Graphite on off-white wove paper

Black fiber-tip ink on off-white wove paper

Graphite on paper

Black ink on cream wove paper

Graphite on paper

Black ink on off-white wove paper

Watercolor over graphite on off-white wove paper

Black ink, graphite, and glue on cream wove paper

Black ink over black crayon and graphite with scratchwork on white scratchboard