I DON’T KNOW if Kaari Upson believed in an afterlife—I never thought to ask—but I know she believed in doubled selves, twinned spaces, and the cosmic undersides they might promise, the profusion of near, almost realities. I know that for Kaari every house had its dream equivalent, a swimming reflection. Kaari loved tract houses, their audacious, abundant banality; I would go so far as to say that she operated under a tract-house theory of the universe. Our earthly realm might be a single house in a long line of houses, rows of identical building plans, identical rooms filled with nothing but