In this image, visitors walk through “Demon of the Growth” in Salm Palace, part of the National Gallery in Prague, Czech Republic. Though this sculpture may look enormous, this portion on the staircase is only a small part of the multistory piece that extends painted spheres (mostly balls for athletics, as far as I could tell) around the museum and even out some of the windows. I’m put in mind most of some kind of gray goo scenario, with out-of-control self-replicating machines on the loose in the museum.