“ With a giant wobbled lurch forward, Tom Sachs’ “Hello Kitty Wind Up” (2008) is, well, exactly that: a Hello Kitty windup toy caught in mid mechanical step, 21 feet tall, cast in bronze. It’s the centerpiece of a set of similar bronze statues by Sachs on display at the plaza of the Lever House building, including two smaller fountains-all modeled after real toy counterparts of Sanrio Co. creations Hello Kitty and My Melody, as well as Dick Bruna’s Miffy character.