The Window Black, measuring 13" x 9", is a delightful addition to various settings like a home, office desktop, mantle, or bookshelf. Handcrafted in Austria since 1988, by the internationally renowned artist Klaus Bosch. Each piece bearing his signature KB stamp. The Flow Time can range from 15 minutes to 2 hours. By tilting the Window Black Moving Sand Art slightly, you can observe a different sand presentation on the front and back. Tilt it at a greater angle to see the sand crawl down the glass, with heavier sands falling to the back – it's quite remarkable! The package includes a Sand picture, Blunt injector, Airscale, and Instruction manual, offering numerous hours of peace and serenity. (The Blunt injector is intended for adult use only.) Adjusting the air levels influences the sand flow speed; more air results in a slower flow, creating dramatic peaks and valleys, while less air leads to faster flow and dune shapes. An ideal gift for the special person in your life who seems to have everything. The KB Collection Window Black Moving Sand Art is made of beech wood and finished with black matte lacquer with coated steel posts. The sand is the Sandman’s classic sand blend, White, Ash, Ruby and Gold glitter. The Window series is an elegant addition to the KB Collection. This design allows you to have a see-through look and rotate the sand picture with-out picking it up. The Window Black Moving Sand Art is 13 x 9” and is a perfect addition to any Home, Office Desktop, Mantle, or Bookshelf making it ideal for any setting. With this sleek modern black design and classic sand blend, The Window Black is destined to go with any decor. If you are giving this as a gift, you know it will be a gift that they talk about for years to come! Your Window Black Moving Sand Art will do several times a day what mother earth takes millions of years to accomplish. Due to the handcrafted nature of each item, each piece bears its own unique qualities. HOW IT WORKS: The KB Collection moving sand art is interactive, ever-changing, mesmerizing and versatile handcrafted art pieces. Turn the sand picture 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.