The Mississauga, Ont., home of David Small. Over the course of his career as a custom home designer, Mr. Small has tailored his work to fit the tastes of all manner of clients. He has done Arts and Crafts bungalows, Tudor mansions, French Provincial chateaux and Cape Cod cottages.But when the time came to fashion a new 3,800-square-foot dwelling for himself, his wife and twin daughters, Mr. Small threw that popular book out the window and took a chance on modernism.Jason Hartog