Entrance to the Baumannshöhle in the Harz Mountains

Black ink and charcoal on cream laid paper

Black crayon and graphite on heavy cream wove paper; verso: black crayon

Graphite on heavy cream wove paper

Graphite on paper

Black marker on paper

Pure flake white pigment on Japanese paper

Colored marker on paper

Opaque watercolor on Yupo paper

Colored marker on paper

Tempera on buff card

Colored marker on paper

Watercolor, black crayon, white chalk, and white gouache on cream wove paper