Massachusetts artist Robert Cumming was featured in Boston this fall in three concurrent exhibitions: a major retrospective of photography, works on paper, sculpture, and painting at the Museum of Fine Arts; a small show of drawings and two sculptures at the Howard Yezerski Gallery; and an intriguing new installation piece at MIT, entitled The Blackboard Brain, 1993. With his darkly humorous manipulations of both language and image and his eccentric investigations into engineering, Cumming created a dark, gridded environment. While in residence at the List Visual Arts Center during the month of