In Toronto, millionaire high school math textbook author Dr. Jim Stewart created a multimillion-dollar mansion, Integral House, referencing the calculus symbol “integral.” The curvy architecture of the property was inspired by the mathematical world to which Stewart devoted his life. The 18,000 square-foot mansion, which features a five-level structure with four bedrooms, eight bathrooms, a spa, infinity pool, elevator and roof garden, is now on the market for $23 million. Learn more about the property.