Although there are no words "Tiangong Kaiwu" in "Kaogong Ji", there are many descriptions of the process of production. Today, with "Cellulose Acetate Animation" as the core, imitating the method of "Kaogong Ji", I make this text:

There is a skill in this day, and it is called Cellulose Acetate Animation. Its production is also well-selected materials, based on cellulose acetate. The craftsman uses ingenuity and makes it according to the law. First, cellulose meets acetic anhydride, is accompanied by a catalyst, and the temperature is appropriate, and then the first product of cellulose acetate is obtained.

Then, through various processes, or dissolved into a liquid, or cast into a mold. Liquid can flow into the vessel, condensing and tangible; mold, regulate its shape, and determine its body. In this process, the heat, strength, and timing must all be in harmony, and if there is a slight difference, it will fall short.

As for the completion of animation, the craftsman's heart is copied and his hands are chased, using cellulose acetate as a medium to give shape and movement, like the change of all things, and the posture of painting a variety of states. Or the flight of a bird, or the running of a beast, or the illusion of the situation and clouds, all of which are lifelike, and the viewer is amazed.

The beauty of this technique lies in the craftsman's ability to turn ordinary materials into magical scenes, and to use the method of intensive research to show the beauty of art, which is really a treasure of craftsmanship.