Richard Chai + Snarkitecture's ice-cave under the High Line. (Photo: David Smith)

Lurking under the High Line has been a bit more fun since Building Fashion began its series of architecture-and-fashion installations in September, erecting a new collaboration every two weeks as a means of reusing the former onsite Sales Tin of Neil Denari’s HL23 condos. On Thursday, Brooklyn firm Snarkitecture and fashion designer Richard Chai will unveil the fourth project in the series, a cave carved by hand from architectural foam. Designed to give shoppers the feel of a glacial cavern, the pop-up shop will feature men’s and women’s fashions displayed on shelves, niches, and hang bars embedded in the foam.

Located at 504 West 24th Street, the store will be open to the public October 21-31 from noon to 6 p.m. The final installation in the Building Fashion series, a collaboration between Siki Im and architecture firm Leong Leong, will be launched November 5, with the adjacent garden designed by Konyk Architecture open through the end of the series.