“Blue Umbrella,” now on view at the MFA, depicts Alex Katz’s wife and muse, Ada.

Courtesy of Museum of Fine Arts, Boston. Graphische Sammlung Albertina, Vienna. Photograph © Albertina, Vienna; Peter Ertl. Art © 2011 Alex Katz/Licensed by VAGA, New York, NY

May. 4, 2012

“Blue Umbrella,” now on view at the MFA, depicts Alex Katz’s wife and muse, Ada. Courtesy of Museum of Fine Arts, Boston. Graphische Sammlung Albertina, Vienna. Photograph © Albertina, Vienna; Peter Ertl. Art © 2011 Alex Katz/Licensed by VAGA, New York, NY