Rosenberg works out of a sun-filled studio at the street-facing end of the railroad apartment he shares with his boyfriend, Gil, who's a surfer, musician, and assistant to the color theorist Donald Kaufman. Although Rosenberg doesn’t fancy himself a musician, he’s the synth player in their band, Jacques Detergent. (“That's day-ter-GEANT,” he says with a French flourish.) When I visited, Rosenberg was working on their record cover — an early draft is pinned to the wall — and preparing for a solo exhibition in Oslo this month called "Wallhangings of Today."