Carroll Dunham’s new works delve into the world of joint locks, pins, and grappling holds. That these and other traditional wrestling moves are performed in the nude and set in lush, vibrant settings add to the ambiguity of the subject matter as it relates to entertainment vs competitive sport, pleasure vs. pain, and brutality vs. virtue.  Composition, color and texture vie, like his sparring partners, for the ultimate superior position. At Gladstone through June 16.