Every year the annual Delta Exhibition at the Arkansas Arts Center is something to see, if only to think on a) how much art has changed, and b) how much we have. For the one sure indication that we're looking at art, good or bad but never indifferent, is its power to send us into reverie. Walker Percy understood. He called such an experience a repetition. "A repetition," his hero and alter ego Binx Bolling explained in "The Moviegoer," "is the re-enactment of past experience toward the end of isolating the time segment which has lapsed in order that it,...