Floating lanterns are often used in festivals around Thailand though it is most famous during the Yi Peng Festival in Northern Thailand. The lanterns are made from oiled rice paper with a bamboo frame. In the middle there is a candle made from flammable material. Once this is lit, the the hot air will start to fill up the lantern and it will eventually float away. As there is no control about where it will come down, floating lanterns are banned from being launched in cities.