? - 1990, Inocente Palacios, Caracas.
1990 - 2016, Colección Patricia Phelps de Cisneros, New York and Caracas, purchased from Inocente Palacios.
2016, The Museum of Modern Art, New York, acquired as promised gift from Patricia Phelps de Cisneros.
The Aspen Institute, Aspen, Colorado, "Two Latin American Modern Artists: Alejandro Otero and Wyllis de Castro", June 29 - November 1, 2006.
Blanton Museum of Art. Austin, Texas. "The Geometry of Hope: Latin American Abstract Art from the Patricia Phelps de Cisneros Collection", February 20 - April 22, 2007 and tour:
Grey Art Gallery, New York University, New York, September 12 - December 8, 2007.
Moderna Museet, Stockholm, "Concrete Matters", February 24 - May 13, 2018.
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