"I wanted to work with the elements as opposed to prints or colors," Katleen says of the home's spare aesthetic. "In London, we have a proper flat. We have a contemporary art collection there—but we didn't want that here. I wanted the walls to be bare, to strip it down to the bare essentials, so I could just play with tonality and texture. So everything's neutral, beiges and grays and whites, and old-wood pieces that feel used and loved."