Carl Turner’s Brixton ‘ice cube’ house. Carl Turner designed the Slip House in a gap in a Brixton terrace. It was arranged like three boxes of milky, translucent glass teetering on top of each other. Admired for its green credentials, it won the RIBA Manser medal in 2013. Carl used “energy piles” as foundations which contributed to a heating system based on a solar-assisted ground-source heat pump. There was rainwater harvesting, a wildflower roof and a work studio on the ground floor.