For more than half a century, Robert Grosvenor has been making beguiling sculptures that toy gingerly with visual perception and conceptual associations. His work is Minimalism made mysterious, improbably, by the stuff of the everyday world, whether car parts or chain-link fencing. He’s one of the best sculptors we’ve got. The centerpiece of his latest one-person outing is a large pool of water, built with hefty concrete blocks and rubber, that is stolid, seductive, and slightly frightening. A back room contains dozens of model airplanes, boats, and other vehicles that Grosvenor has in many cases subtly altered: familiar objects slowly becoming something else, different and strange.