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

Graphite on paper

Graphite on paper

Graphite on off-white wove paper

Black conté crayon on ivory tracing paper

Black ink and gray wash on cream laid paper

Graphite on off-white wove paper

Watercolor and graphite on graph paper

Graphite on paper

Crayon on paper

Crayon on paper

Watercolor over graphite on off-white wove paper

Pen and black ink over graphite on off-white wove paper