DRAMA LESSON: Behind its quaint Victorian facade, this Toronto house by gh3 architects explodes into dramatic open spaces, nearly all white . The home’s centrepiece is a staircase clad in white Corian. Above it, a discreet clerestory window funnels in sunlight; the graphic wall cutouts, based on old wallpaper patterns discovered during renovations, add a decorative touch.Naquib Hossain