A Ferrari arouses complex emotions, ranging from envy to scorn to class hate, and doubtless many more, including, perhaps occasionally, admiration. A Fiat Topolino rolling by raises only a smile. It is 13 brake horsepower of wit, charm, and elegance. It is a car that is hard not to love. This one has the canvas roof rolled back as it exits a cool, dark, fume-laden garage on a sunny day, which is why its interior glows.