Some artists we appreciate for their growth. For their ability to absorb and adapt new styles, new techniques, new ways of seeing and of transferring that vision to a sheet of paper, a canvas or a mound of clay. "Accidental Genius: Art from the Anthony Petullo Collection," which opened last Friday at Milwaukee Art Museum, celebrates artists who were influential and creative despite their stagnation, says collector Petullo, who has gifted the works in the show to the museum.