These are "sky lanterns." Lanterns of this type are a reality - they are essentially small hot air balloons which have been used for hundreds of years in festivals. read more
Needless to say a degree of caution is necessary, sky lanterns can catch fire, or start fires in surrounding woods etc. When lit on a still, breezeless night, the interior of the bag heats up making it lighter than the surrounding air, and the bag floats gently upwards. read more
The lanterns in Tangled strongly resemble Kongming Lanterns, also known as Chinese Lanterns. read more
How to Make Sky Lanterns. Four Parts: Making the Paper Shell Building the Frame Preparing the Fuel Lighting Your Sky Lantern Community Q&A. A sky lantern is a lantern with a paper shell and wire frame that holds a fuel source. When the fuel source is lit, the lantern fills with air and floats into the sky. read more