In the Antenna wing of the Science Museum in London, a bronze bust of a man sits behind a wall of glass. The face, which belongs to BBC presenter Marty Jopson, isn’t very big—maybe 6 or 7 inches tall. It’s highly textured, and light catches in its rivets and dimples. Aside from the playfully upturned edges of Jopson’s mustache, there’s nothing particularly remarkable about this bust. But next to it sits an identical bust that absolutely boggles the mind. It looks like someone has cut a hole in the air in the shape of Jopson’s head, leaving only a gaping, empty blackness.