Author of “Edward L. Loper Sr., The Prophet of Color,” Marilyn Bauman will speak about the late painter’s place in the art world and the influence of Violette de Mazia, who taught art appreciation at The Barnes Foundation. “Edward L. Loper Sr. and Violette de Mazia: Revelations in Perception” is free at the Biggs Museum of American Art in Dover on Sept. 21. (674-2111, biggsmuseum.org)
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