For more than fifty-five years, Ron Nagle has asserted his quixotic mind and humor throughout a wildly creative life in both sculpture and, perhaps lesser known to art audiences, music. His latest exhibition, “Necessary Obstacles,” presents eighteen new characteristically small objects fashioned from clay, epoxy resin, and catalyzed polyurethane, along with six drawings. Having investigated the cup form’s possibilities for decades, Nagle constructs grotto-like microarchitectures less than six inches high in these recent works, which delineate exterior/interior divides.

Some sculptures evoke