Upstairs on Level 5 is a room painted top to bottom in black gloss, the setting for a hexagonal structure clambered over by an apelike celebrant of some unspecified esoteric rite. Phantom by Ross Fleming is a visceral telling of a secreted ritual, an act that’s all the more thrilling for being concealed behind a veil of darkness. Coming to it from the bright, airy Crawford corridors is much like stumbling into a black metal fan’s bedroom during a museum tour, and makes for a startling discovery.