Klaus Bosch"s Rainbow Vision Sand Pictures are interactive, ever-changing, mesmerizing and versatile art pieces. Put them on your desk and watch them evolve with a new creation with each turn. Put our movies on the wall and enjoy the added dimension of the image to enhance the performance of the sand. We offer a range of Sand Pictures for every budget and every person. The Windows are 13 x 9" and are the ideal size for the desktop use at the home or the office. You can tilt the Windows at an angle to watch different presentations of sand on the front and back side (the heavier sands will fall to the back. It is actually different!). Tilt at a greater angle and watch the sand crawl down the glass. The Black Diamond Window is a limited edition of 2,999 pcs, each hand numbered by Klaus showing the piece number in the edition. Prominent sands are black, red and gold. Klaus makes the Rainbow Vision Sand Pictures in his studio in Lustenau, Austria. Each piece is handcrafted with love and attention to detail. He uses a complex, yet beautiful blend of sand which is carefully selected for each frame color. Turn the sandpicture over to watch the battle of the elements: The sand just wants to settle at the bottom, the air just wants to escape to the top, the water hosts the party. The result is the sand trickles between the air bubbles to create fascinating stratifications in the sand mountains. A slower flow of sand will result in a delicate trickle of sand making more dramatic peaks and valleys. A faster flow of sand will make dune shapes. Best of all is you can control the amount of air in each sand picture so you can make the sand fall as fast or as slow as you want with the injector we include in the art. The Sand Pictures are educational for children while soothing and relaxing for adults. There are many sizes and shapes to choose from. A sandpicture will do several times a day what mother earth takes millions of years to accomplish.