The best theaters allow audiences to be in two extraordinary places at once. Characterful foyers and auditoria create a sense of occasion as playgoers move from street to seat, but after the lights go down the architecture must also allow the world of the play to emerge, evoked by stagecraft and completed in the imagination of the spectator. It’s a balancing act that has been pulled off with finesse by London-based Haworth Tompkins, joined by Swedish practice White Arkitekter, in the remodeling of Malmö Stadsteater, one of Sweden’s leading city theaters.