If the week’s unseasonable heat has you worried about global warming, a trip to West Chelsea might help soothe your soul. At the far end of 23rd Street, in the shadow of the High Line, sits a large block of ice. This ice―actually a glacial cavern of carved styrofoam―is the fourth in a series of pop-up shops that form the Building Fashion project, the brainchild of arts organization BOFFO and architect and designer Spilios Gianakopoulos. The current iteration, which opened last Friday with a party, where Metric performed an acoustic set, co-hosted by The Last Magazine and Droog, features Richard Chai’s men’s and women’s collections, and was designed by the artist-architect partnership Snarkitecture.