Li - Trigram (Fire) - Armoury, Semper Galery in Dresden

The Trigram Li

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stands for fire, fast horses, armours, helms, lances, weapons and generally for things which are soft within and hard outside (shells, snails etc.), it´s the sticking one, the shiny one (decoration).
It´s a perfect description of old warriors, sitting on their horses, throwing with fireballs or carrying lances to attack each other.
The hard armour covers the (soft) body. This is meant by soft inside, hard outside.