In the nonstop hustle of Columbus Circle, MAD offers a place of calm, hosting a paper-cutting workshop as part of its series dedicated to the international craft. Traditional Chinese techniques are on the lesson plan this afternoon and there's an open-door policy in effect: everyone is welcome, from the artistic and curious to the superstitious. Although most creations will be of the 2D breed, those more learned can unfold a decorative 3D lantern, or perhaps even a tiger, in honor of its yearlong run on calendars from here to Hong Kong.