Elegant, simple and deceptively difficult to solve, this endearing metal puzzle can also be worn as a necklace. The two interlocking pieces are precisely engineered to produce a highly satisfying tactile experience. Most find this nearly 2" loop much easier to take apart than it is to put back together but once you discover the secret to the mechanism, you'll never forget it. Designed by Vesa Timonen for Hanayama of Japan.