Mild steel, pebble, brass, lacquered copper wire, and leather

Papier-mâché, stainless steel, sterling silver, fine silver, balsa wood, and graphite

9k gold, stainless steel, fine silver wire, and papier-mâché

Stainless steel, papier-mâché, lacquer, graphite, 23k gold leaf, and silver

Monel, sterling silver, and 18k gold

Stainless steel, papier-mâché, and 18k gold

Graphite and ink on paper

Graphite on paper

Graphite on paper

Graphite on paper

Graphite on paper

Graphite on paper

Graphite on paper

Graphite and ink on paper

Sterling silver and Monel