Architectural model in colour, Competition entry 142, City Hall and Square Competition, Toronto, 1958, by Lam, Pacheco & Wong of the United States. No first name for Wong. Two inverted pyramids.
Toronto Public Library's Digital Archive: http://www.torontopubliclibrary.ca/detail.jsp?Entt=RDMDC-CITYHALL-A-R6-10&R=DC-CITYHALL-A-R6-10
Nathan Philips Square (Toronto, Ont.)
Downtown (Toronto, Ont.)