Under the principle of simplicity

The compositions should be limited in number. In the firework world, variation is most important, and the types of compositions are apt to increase more and more. This is not good for safety control. It is best to have only a limited number of fundamental compositions, obtaining variation by changing the combinations. 

The kinds of firework items manufactured in one factory should also be limited. For this reason it is best to have a guild and divide the work among the factories so that each can produce a limited items. 

The kinds of firework material are then possibly limited. 

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Under the principle of conservation 2. 2. Under the principle of maintenance 2. 3 Under the prinqiple of clearness 2. . Under the principle of simplicity 2. 5 Under the principle of separation and isolation... 

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