Glass pipes combine form with function to create pieces that are both useful and beautiful. They are available in countless styles and colors, from extremely simple to wildly imaginative, and allow users a wide range of smoking experiences. Simple hand pipes are little more than glass tubes. At the other end of the spectrum, bubblers with double or even triple chambers approach engineering marvels with helical smoke chambers and ice reservoirs for cooling the smoke. Far more complex than windowpane glass, glass pipes are constructed with artistic skill and precise chemical formulas that result in colors and designs once thought impossible from glass. They are available in every color imaginable, and some even change colors as they are used. Some are cut and polished from larger pieces of glass, like gemstones, while others are woven together from delicate strands as fine as blades of grass.