South Tower of Cathedral, Barcelona

Graphite on ivory laid paper

Charcoal on cream laid paper

C-print (magenta and cyan color separation) mounted on foam-core with felt-tipped pen numbers, black ink grid, acrylic airbrush marks, and masking tape

Graphite on buff wove paper

Black ink and white crayon on orange wove paper

Black ink and charcoal on cream laid paper

Graphite on off-white laid paper

Black ink on cream wove paper

Black ink on off-white wove paper

Blue, yellow, and white colored pencil on tracing paper

Watercolor and gouache on white wove paper

Black ink on brown laid paper