Yi Peng Sky Lantern Festival
A big festival, where thousands of Kom Fai (paper lantern-balloons) are floated in to the air during a Buddhist ceremony, is held each year, a week ahead of the actual Loi Krathong festival, in the town of Mae Jo, some 20 km north of Chiang Mai, Thailand.
Sky lanterns are airborne paper lanterns traditionally found in some Asian cultures. They are constructed from oiled rice paper on a bamboo frame, and contain a small candle or fuel cell composed of a waxy flammable material. When lit, the flame heats the air inside the lantern, thus lowering its density causing the lantern to rise into the air. The sky lantern is only airborne for as long as the flame stays alight, after which the lantern floats back to the ground.