A fascination with M.C. Escher is usually a sign that somebody has discovered pot. But the two don't necessarily have to go together. This puzzle—for kids who hopefully have no idea what that funny-smelling stuff in mommy's handbag is—features 15 lizard cutouts that can be arranged and rotated in countless patterns for hours of chemical-free fun. http://www.momastore.com

Photo: Courtesy of the MoMA Store