The beautiful, funny The Wrong Trousers is Nick Park’s Oscar-winning animated short about Wallace, a mild-mannered inventor; Gromit, his highly intelligent dog; and a pair of mechanical pants that cause Wallace and Gromit grief. And, oh yes: a mysterious, vaguely malevolent penguin shows up to rent an upstairs room. The Wrong Trousers isn’t a cartoon; Park fashions figures out of clay and wax, poses them, and animates the results. You can see how he does it in a terrific little film, following The Wrong Trousers in this hour, called The Making of The Wrong Trousers. (Park himself proves to be utterly charming describing his meticulous labor.) There’s a calmness and precision to the tone and humor here that marks its creator as British. Indeed, it is the very quietness of this film — in which your attention is drawn to the sound of the scrape of a knife spreading jam on a piece of toast — that makes it such a blessed contrast to so much American animation. In its witty modesty, The Wrong Trousers is a small masterpiece.