Borromini's San Carlo a la Quatro Fontane, Rome

Charcoal on cream paper

Metalpoint on prepared paper

Graphite on tan wove paper, laid down

Graphite and black crayon on tracing paper

White and red chalk on brown wove paper

Watercolor, with scratchwork, on off-white wove paper

Dark brown ink and watercolor on tan wove paper

Watercolor and red ink over graphite on cream paper

Watercolor, gouache, shell gold, and platinum paint on linen-covered panel prepared with zinc white ground

Transparent and opaque watercolor, graphite, and gum arabic on cream paper

Ink over graphite