I think everyone’s pattern is different. Edward’s seems to be the tree of life or something. The tree of life is something from Hebrew Judaism. I don’t know the details very well. You can search it yourself on Baidu. Supplement, this also appears in EVA.
The knowledge learned by the alchemist is recorded on the door. There is a flame pattern on the door of Osamu. Ed is a relatively complex student and can light everything. There is nothing on the door of the little man in the bottle. Maybe because he knows Too much? Or is it because of artificial humans? (Ask Aunt Niu specifically)
I thought about this issue when I was watching 03 a long time ago. I think from the author’s perspective, what he wants to express may be equivalent exchange. , in fact, we also have equivalent exchange in real life. Various conservation laws are a kind of equivalent exchange
It seems that it may be the Kabbalah Tree of Life. Because this thing, just like the Chinese Five Elements Theory, is the core of all occultism in the West. Whether it is alchemy or Tarot divination, the Kabbalah Tree of Life is mentioned.