Riddling is a technique of the traditional Champagne production process. It is the moving of sediment to from the bottom of a bottle to the neck. Today the process is largely done by machine, but historically the process was done by hand. Bottles are placed neck down in a special rack called a pupitres. Over the period of several weeks a worker periodically twists each bottle encouraging any sediments to loosen from the glass and be moved by gravity to the neck of the bottle. When the whole process is finished, the sediments in the neck of the bottle are frozen and ready for degorgement. (Wine/Production)