Sheena Wagstaff, chairwoman of the Metropolitan Museum of Art’s modern and contemporary art department, was relatively new on the job in 2013 when Pamela J. Joyner, a prolific art collector and supporter of artists of African descent, invited her on a trip to Washington to visit the studio of the Color Field painter Sam Gilliam. They looked at Mr. Gilliam’s in-progress pieces, a series of striking works with a thin stream of paint poured on board.
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