? - 1997, Sylvio Nery da Fonseca, Escritório de Arte, São Paulo.
1997 - 2016, Colección Patricia Phelps de Cisneros, New York and Caracas, acquired as gift from Sylvio Nery da Fonseca.
2016, The Museum of Modern Art, New York, acquired as promised gift from Patricia Phelps de Cisneros.
Galeria Belvedere da Sé, Salvador de Bahía, Brazil, "Exposição de arte neo-concreta", 1959.
Museu de Arte Moderna do Rio de Janeiro, Rio de Janeiro and Secretaria da Cultura, Ciência e Tecnologia do Estado de São Paulo, São Paulo, "Projeto Construtivo Brasileiro na Arte", 1976.
The Aspen Institute, Aspen, Colorado, "The Rhythm of Color: Alejandro Otero an Willys de Castro, Two Modern Masters in the Colección Patricia Phelps de Cisneros", June 29 - November 1, 2006.
Los Angeles, The J. Paul Getty Museum, "Making Art Concrete: Works from Argentina and Brazil in the Colección Patricia Phelps de Cisneros", September 16, 2017 - February 11, 2018;
Moderna Museet, Stockholm, "Concrete Matters", February 24 - May 13, 2018.
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