Anonymous photographer, Joan Mitchell and Jean Paul Riopelle in Chicago, about 1957. Yseult Riopelle Archives. Work shown: Jean Paul Riopelle, Untitled, about 1957. Oil on canvas, 60 × 73 cm. Private collection © Estate of Jean Paul Riopelle / SODRAC (2017)

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Anonymous photographer, Joan Mitchell and Jean Paul Riopelle in Chicago, about 1957. Yseult Riopelle Archives. Work shown: Jean Paul Riopelle, Untitled, about 1957. Oil on canvas, 60 × 73 cm. Private collection © Estate of Jean Paul Riopelle / SODRAC (2017)

Anonymous photographer, Joan Mitchell and Jean Paul Riopelle in Chicago, about 1957. Yseult Riopelle Archives. Work shown: Jean Paul Riopelle, Untitled, about 1957. Oil on canvas, 60 × 73 cm. Private collection © Estate of Jean Paul Riopelle / SODRAC (2017)

Anonymous photographer, Joan Mitchell and Jean Paul Riopelle in Chicago, about 1957. Yseult Riopelle Archives. Work shown: Jean Paul Riopelle, Untitled, about 1957. Oil on canvas, 60 × 73 cm. Private collection © Estate of Jean Paul Riopelle / SODRAC (2017)