Already, with its sliced-up façade, the Storefront is one of the city's strangest spaces, but here Daniel Arsham and Alex Mustonen, his partner in Snarkitecture, have filled the narrow triangular room with EPS architectural foam, then carved out a series of new spaces with hammers, chisels and picks. The labyrinthine outcome is both organic in form and materially artificial, full of unexpected nooks and strange textures.