In conjunction with the exhibition "Century of the Child: Growing by Design, 1900–2000," which presents a hundred years' worth of toys, games and playground designs, MoMA offers you and your tween the chance to participate in a hands-on design workshop. Join forces with your child as you learn what needs to be considered when designing for kids and how creative the most functional objects can be. Preregistration recommended. Free. Ages 10 to 14.