An elaborate system marries the factory, where customers gawk at the product, to the store, where customers sample (and buy) the product. The beans that are destined for in-house consumption make their way from the factory line to the main bar by a separate tubing system—beans are sucked pneumatically through a wave of copper pipes into a central coffee bar. Why use copper tubes instead of the transparent style used in the factory? In part, the clear tubing used elsewhere couldn’t be bent with the desired sculptural angles without giving the material an unappetizing blue tint. Muller also liked the aesthetic of copper and the sound that it makes.