The home’s enclosed courtyard sits at “the heart of the structure,” says Baumann, who resides with his wife, Lisa Sardinas, and eight-year-old son, Oskar. “This is clearly the dominant space; everything flexes towards it.” Baumann cast the square concrete floor tiles himself, enlisting the help of his son. A small, neat patch of grass—a playful nod to the archetypal domestic lawn—is edited down to a charming folly.