Studies for Drop I 1987 Material: Pencil and Indian ink on paper Size: 21.5 x 28 cm

Studies for Elements and Drops IV 1987 Material: Indian ink on paper Size: 21.5 x 28 cm

Study for Elements and Drops V 1987 Material: Indian ink on paper Size: 21.5 x 28 cm

Study for Elements and Drops V 1989 Material: Pencil on paper Size: 21.5 x 28 cm

Multiple Study III 1979 Material: Pencil and varnish for marble on Fabriano paper no. 4 Size: 24 x 34 cm

Preliminar Sketches IV 1982 Material: Pastel on paper Size: 17.6 x 27 cm Simón Bolívar’s Bicentenary

Preliminar Sketches, B-C 1982 Material: Pastel on paper Size: 21.6 x 28.3 cm Simón Bolívar’s Bicentenary

Study for Circle Squaring 1980 Material: Greasy pencil, red wine and varnish for marble Size: 21 x 29.6 cm

Study for Column III 1981 Material: Indian ink, Fabriano paper no. 4 and parchment paper Assemblage Size: 24 x 34 cm

Study for Gray Structure 1980 Material: Pastel and pencil on paper

Study for Column IV 1981 Material: Indian ink, Fabriano paper no. 4 and parchment paper Assemblage Size: 24 x 34 cm

Study for Column V 1981 Material: Indian ink, Fabriano paper no. 4 and parchment paper Assemblage Size: 24 x 34 cm

Clock 1977 Material: Graphite on paper and photographic negative Size: 23 x 30 cm Guadalajara Collection

Material: Graphite on paper and photographic negative Size: 23 x 30 cm Guadalajara Collection

Shock Wave Study 1976 Material: Graphite on paper and photographic negative Size: 23 x 30 cm Guadalajara Collection

Center A 1977 Material: Graphite on paper and photographic negative Size: 23 x 30 cm Guadalajara Collection