El Sur, 1969; acrylic emulsion on canvas, 48 x 48 in.; 122 x 122 cm. Bronfman Collection, New York.

Tlön, 1969; acrylic emulsion on canvas, 48 x 48 in.;122 x 122 cm. Courtesy Cecilia de Torres Ltd., New York.

The Sweetest Skin, 1970; acrylic emulsion on canvas, 59 x 59 in; 150,2 x 150,2 cm. Collection Centro Andaluz de Arte Contemporáneo, CAAC, Seville, Spain.

Who Was Who in Last Night's Dream?, 1970; acrylic emulsion on canvas, 60 x 60 in; 152,5 x 152,5 cm. Collection Peter Klimt, London.

I Wonder Why, 1971; acrylic emulsion on canvas, 48 x 48 in; 122x 122 cm. Courtesy Cecilia de Torres Ltd., New York.

Fricción, fricciones, 1971; acrylic emulsion on canvas, 52 x 39,5 in; 130 x 100 cm. Collection Gonzalo Segnini, Miami, Fla.

Díptico sin título, 1971; water color pencils on canvas, two parts, 43 x 69 ¼ in.; 110 x 176 cm (instalado). Courtesy MCMC Gallery, Buenos Aires.

The Hidden Order, 1972; acrylic emulsion on canvas, 42 x 42 in; 107 x 107 cm. Collection The Museum of Modern Art, New York.

Sagittarious, 1972; acrylic emulsion on canvas; 42 x 42 in; 107 x 107 cm.. Courtesy Cecilia de Torres Ltd., New York.

Sequential, 1972; acrylic emulsion on canvas, 4 panels, 54 x 80 in; 137 x 203cm. Collection Albright-Knox Art Gallery, Buffalo, NY.

Paradox, 1972; acrylic emulsion on canvas, 4 panels, 66 x 78,7 in; 167,6 x 200cm. Bruce and Diane Halle Collection, Phoenix, Arizona.

Cerulean, Black & Brick Red, 1972; acrylic emulsion on canvas, 4 panels, 66 x 98,5 in; 167,6 x 248,3cm. Etzold Collection Städtiches Museum Abteiberg Mönchengladbach, Germany.

1.2.1.2, 1972; acrylic emulsion on canvas, 4 panels, 60 x 51 in; 152,4 x 129,5 cm. Courtesy Galerie Denise René, Paris..

Black & Tan Fantasy, 1974; acrylic emulsion on canvas, 3 paneles, 54 x 64 in; 137,2 x 162,5 cm. Collection the artist, Segovia.

Black, Rust, Yellow, 1974; acrylic emulsion on canvas, 3 paneles, 39 x 40 in; 99 x 101,6cm. Collection Museo Nacional Centro de Arte Reina Sofía, Madrid.

Uqbar, 1975; acrylic emulsion on canvas, 58 ½ x 59 in; 149 x 150cm. Courtesy Cecilia de Torres Ltd., New York.

Untitled (Trio), 1976; acrylic emulsion on canvas, 3 panels, 59 x 78 in; 150 x 198cm. Courtesy Cecilia de Torres Ltd., New York.