Untitled, 1963; tempera on paper, 15 ½ x 7 ¼ in; 38,5 x 18,5 cm. Courtesy MCMC Gallery, Buenois Aires.

From de Series Magic Baloons, 1964; tempera and collage on paper, 9 x 6 ½ in; 22,7 x 16,8 cm. Collection the artist, Segovia.

From de Series Magic Baloons, 1964; tempera and collage on paper, 12 x 8 in; 30,4 x 20 cm. Collection the artist, Segovia.

Merry Go Round, 1965; tempera on paper, 7 x 7 in; 18 x 18 cm. Collection the artist, Segovia.

Orange, Magenta, Blue, 1966; tempera on paper, 7 x 7 in; 17,5 x 17,5 cm. Courtesy MCMC Gallery, Buenos Aires.

Untitled, 1966; tempera on paper; 11 ½ x 13,7 in; 29 x 35 cm. Courtesy MCMC Gallery, Buenos Aires.

Fontessa, 1966; tempera on paper, 19,7 x 15,7 in; 50 x 40 cm. Collection Museo Nacional de Bellas Artes, Buenos Aires.

Modelo para armar, 1971; graphite and watercolor pencils, 36 x 48 in; 91 x 122 cm. Courtesy Cecilia de Torres Ltd., New York.

Archetypal Geometry Series, IV, 1982; acrylic emulsion and m/m, 22 x 22 in; 56 x 56 cm. Courtesy Cecilia de Torres Ltd., New York.

The 4 Parts of the World, 1997; acrylic emulsion and m/m, 29 ½ x 29 ½ in; 75 x 75 cm. Courtesy Cecilia de Torres Ltd., New York.

Quartet: Contrasts & Fugues, 2005; tempera on folded paper, 22 x 30 in; 56 x 76 cm. Courtesy MCMC Gallery, Buenos Aires.

Deconstrucciones #15, 2009; tempera and gesso, 22 x 30 in; 56 x 76 cm. Private collection. Courtesy Guillermo de Osma Gallery, Madrid.

Sets & Progressions, 5, 2010; tempera on folded paper, 26 x 43 ½ in; 66 x 110 cm. Courtesy MCMC Gallery, Buenos Aires.

Paper Construction # 14, 2014; tempera and collage, 12 x 11 ½ x 2 ¼ in; 30 x 29 x 6 cm. Courtesy MCMC Gallery, Buenos Aires.

Paper Construction # 152014; tempera and collage, 12 x 12 x 2 in; 30 x 30 x 5 cm. Courtesy MCMC Gallery, Buenos Aires.

Hilos de Agua (a), 2015; water color pencils, 22 x 22 in; 56 x 56 cm. Courtesy Galerie Denise René, Paris.

Hilos de Agua, (b) 2015; water color pencils, 22 x 22 in; 56 x 56 cm. Courtesy Galerie Denise René, Paris.

Paper Construction,# 23, 2016; tempera, 10 ½ x10 ½ x 2 in; 27 x 27 x 5 cm. Private collection. Courtesy Guillermo de Osma Gallery, Madrid.