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Fig. 1,  Abercrombie, Gertrude, Untitled (Ballet for Owl), oil on board (12 ¾ x 15 ¼ in), 1952. Modernism in the New City: Chicago Artists, 1920-1950 The Collection by Bernard Friedman, http://www.chicagomodern.org/art/view/untitled_lballet_for_owl