Paul Behnke photo blogs visits to several current exhibitions in Chelsea including: Jay DeFeo at Mitchell-Innes & Nash (through June 7), Joel Shapiro: Works on Paper 2011-2013 at Pace Gallery (through June 28), Joan Mitchell: The Black Drawings and Related Works at Lennon, Weinberg, Inc (through June 28), Joan Mitchell: Trees at Cheim & Read (through August 29).