Untitled (adhered color photocopy of Halde Rheinpreußen, left page); Untitled (adhered color photocopy of Halde Rheinpreußen, right page)

Blue pen on adhered sheet and adhesive on paper

Colored marker on paper

Graphite and colored pencil on paper

Graphite on paper

Colored marker on paper

Colored marker on paper

Colored crayon on paper

Graphite on paper

Graphite on paper

Blue, yellow and green crayon on paper

Graphite and blue crayon ; blue crayon on paper

Colored marker on paper