Like a haphazard pile of books, Stack House is a playful expression of horizontal volumes, which are stacked on top of and cantilevered from each other. The structure is divided into three blocks containing the public, transitional, and most private programs. Penetrating all these volumes is the quadruple-height staircase with diverse light shafts around it, travelling from the skylights all the way down to the basement. Located in Forest Hill neighborhood in Toronto, the monotonous, dark presence evokes a sense of monumentality, hinting at the spatial order.