Willys de Castro, S/T , 1959. Mixed media, 1 1/8 x 1 3/8 in. (3.5 x 5 cm)

Luis Roldán. Wash & wear , 2013. Enamel on metal, lint balls and hair. Dimensions variable

Willys de Castro. S/T , c.1959. Mixed media on paper, 5 5/16 x 8 1/16 in. (15 x 21 cm)

Willys de Castro, S/T , 1959. Gouache on paper, 9 5/16 x 5 1/16 in. (25 x 13.5 cm.)

Willys de Castro. Estudo para Soma entre planos , c.1959. Gouache on paper, 3 5/16 x 3 5/16 in. (10 x 10 cm)

Willys de Castro, Projeto para Pluriobjeto , 1988. Mixed media on tracing paper, 18 3/16 x 25 3/16 in. (47 x 65 cm)

Willys de Castro, Projeto para Pluriobjeto , 1988. Mixed media on tracing paper, 18 3/16 x 25 3/16 in. (47 x 65 cm)

Willys de Castro, Estudo para objeto ativo , c. 1959. Gouache on paper, 3 1/4 x 8 1/4 in. (9.5 x 22 cm)

Willys de Castro. Projeto para pintura , c.1958. Gouache on paper, 19 1/4 x 19 1/16 in. (50 x 49 cm)

Willys de Castro, S/T , c.1950s. Gouache on paper, 7 5/16 x 8 3/16 in. (20 x 21.8 cm)

Luis Roldán. Respiraciones , 2013. Graphite on paper, 26 x 40 in. (66 x 101.5 cm.)

Willys de Castro S/T , c. 1950’s. Gouache on paper, 5 1/4 x 10 3/16 in. (14.5 x 27 cm)

Willys de Castro. Estudo para pintura , c.1959. Gouache on paper, 8 1/8 x 5 1/4 in. (21.2 x 14.4 cm)

Luis Roldán. Numerales , 2008-2010. Found tickets and acrylic on paper. 12 x 9 5/8 in. (31.5 x 24.5 cm.) each. 100 pieces

Willys de Castro. Projeto para pintura , c.1958. Gouache on paper, 19 1/4 x 19 1/16 in. (50 x 49 cm)

Willys de Castro. NT , 1965. Gouache on paper. 10 x 11 1/16 in. (25.5 x 28.5 cm)

Willys de Castro. Estudo para objeto ativo , c. 1959. Gouache on paper, 3 x 7 1/16 in. (8 x 18.4 cm)

Luis Roldán. Cantos , 2008. Graphite emulsion and ink on fabric. Dimensions variable

Luis Roldán. Cantos , 2008. Graphite emulsion and ink on fabric. Dimensions variable. (Detail)

Luis Roldán. La Pared , 2013. Powder paint on metal, collage on paper. 11 1/2 x 12 in. (29.2 x 30.5 cm.) each. 17 pieces

Luis Roldán. La Pared , 2013. Powder paint on metal, collage on paper. 11 1/2 x 12 in. (29.2 x 30.5 cm.) each. 17 pieces (Detail)

Willys de Castro. Cartaz-poema , 1959. Letterpress on paper, mounted on board. 18 3/16 x 18 3/16 in. (47 x 47 cm.)

Willys de Castro. Cartaz-poema , 1959. Typographic print on paper glued on card, 18 3/16 x 18 3/16 in. (47 x 47 cm)

Willys de Castro. Cartaz-poema , 1959. Typographic print on paper glued on card, 18 3/16 x 18 3/16 in. (47 x 47 cm)

Willys de Castro. Estudos para pintura , 1957-58. Ink on paper. 8 1/4 x 6 3/16 in. (22 x 16.5 cm.)

Willys de Castro. Projecto para Pintura 167 , 1956. Gouache on paper. 7 x 7 in. (18 x 18 cm.)