Klaus Bosch’s Rainbow Vision Sand Pictures are interactive, ever-changing and mesmerizing art pieces. Watch them create a new sand picture each time! The Kugel Pendels are made in Germany by Stefan Wiese of high grade stainless steel. The crystal spheres are optic grade. The spinning coils result in a great optical illusion of the floating ball. Take the game with you! The Sondergut leather board games roll up to the size of a pocket umbrella (10 x 2”). Great for travel or the home!