Nicolai Ouroussoff says that Frank Gehry’s reimagining of the Art Gallery of Ontario “may catch some fans of the architect off guard. Rather than a tumultuous creation, this may be one of Mr. Gehry’s most gentle and self-possessed designs. It is not a perfect building, yet its billowing glass facade, which evokes a crystal ship drifting through the city, is a masterly example of how to breathe life into a staid old structure.”