On day twenty of advent we bring you this fabulous set of bubble lights. Patented in 1935 by American Inventor Carl Otis, bubble lights had, by the 1940’s became the must have accessory for the Christmas tree. This Juggler set are by U.C. and date from around the mid-20th Century. The lights themselves are glass tubes filled with the chemical methylene chloride. At the base of each tube is a bulb which heats the methylene chloride up to make it bubble and In most the liquid is tinted a different colour.