“Robert Charles Howe: Visual Purple,” an exhibition of paintings, drawings, and constructions done by the Chicago artist after surgery to correct his failing eyesight, is on view through December 10 in the SXC Gallery at Saint Xavier College, 3700 W. 103rd St. (779-3300). Hours are 10-5 Monday through Friday and noon-5 Saturday. Shown here is a detail from Run for the Oreo.