In her recent exhibition “Caerulea,” Clare Rojas continued the investigation of abstraction she embarked on in 2011, in a departure from the work for which she is best known: whimsical paintings that, like the work of her San Francisco Mission School cohort, take up the aesthetics of sign-painting and street art, though often with a feminist twist. Purged of her signature folksy and fairy-tale-like imagery—stylized animal and matryoshka doll figures and boldly patterned borders and backgrounds derived from quilting and outsider or craft-based techniques—these new oil paintings on canvas