A confection of arches and windows has emerged in the Gospel Oak neighborhood of Camden in northwest London, thanks to Peter Morris Architects and a unique collaborative ownership approach. “The Cloud House,” which actually comprises two side-by-side townhomes, practically froths from its foundations. One side is occupied by the architect himself along with his partner, Emily, while the other half is owned by a resident who embraced the stylistic potential of the project and agreed to the exterior design and the same contractor.

Ten years in the making, “The Cloud House” is a playful response to its eclectic neighboring architecture, from the quirky Victorian church of St. Martin’s to a school next door that has a stone exterior mimicking a castle. Morris conceived of a bright, whimsical design with pink walls, robin’s egg-blue window frames and doors, and arched details in relief made from a dense recyclable polystyrene that mirrors the arches of the church across the street. See more on the firm’s Instagram.