Medium: Mixed Media Material: Cardboard Dimensions: 28 x 28 x 3 cm, in wooden frame 30 x 30 x 3 cm Year: published 1964 Signature: handsigned on the back with pencil (Willys) Provenance: Edition Panderma, Carl Laszlo, Basel Galerie von Bartha, Basel Private Collection, Basel Condition / Restauration: mint archival condition Willys de Castro (February 16, 1926 – June 5, 1988) was a Brazilian visual artist, poet, graphic designer, industrial designer, stage designer and magazine editor. De Castro is best known for his "Active object" series and is considered to be a pioneer and founding contributor of the Neo-Concrete Movement. Castro joined the Neo-Concrete Movement in Rio de Janeiro along with Lygia Clark, Hélio Oiticica, Franz Weissmann, Lygia Pape and others. The following year de Castro participated in "Konkrete Kunst" an exhibit organized in Zurich by Max Bill. From 1959 to 1962, de Castro developed his "Active object" series. In 1963 together with Hércules Barsotti, Lothar Charoux, Waldemar Cordeiro, Luiz Sacilotto among others, De Castro became one of the founders of the São Paulo based art gallery Associação de Artes Visuais Novas Tendências which operated until 1965. Associação de Artes Visuais Novas Tendências was founded and managed by artists working within the Concrete and Neo-Concrete movements but did not solely feature Concrete and Neo-Concrete art. The galleries goal was to provide a space and platform for contemporary art to be presented outside the confines of any particular artistic movement.