Each time I visited the space to see “Shotgun Inversion,” fellow onlookers seemed more or less unaware of or unconcerned by its status as a sculptural object. People leaned up against the wall or brushed their fingers against it as they passed, chain-link fence-style. A friend and I hung our arms over the waist-high partition on one side like it was a carnival booth. One visitor wondered aloud what she’d do if she dropped her phone on the other side of the structure.