What does the pattern on everyone's door of truth mean in The Alchemist of Steel?

I think everyone's design is different. Edward's seems to be the tree of life or something, the tree of life and Hebrew Judaism. I don't know much about it. You can make it up yourself. This also happened to EVA.

The knowledge learned by the alchemist was recorded on the door, and the flame pattern was on the colonel's door. Ed learns a lot of things and knows everything. There is nothing on the door of the little man in the bottle, perhaps because he knows too much. It's still the reason for artificial people, (specifically ask Aunt Niu)

I thought about this question when I watched 03 a long time ago. I think what I want to express from the author's point of view may be equivalent exchange. In fact, we also have equivalent exchange in real life, and all kinds of conservation laws are equivalent exchange.

It seems that it may be Kabala's tree of life. Because this thing, like China's Five Elements Theory, is the core of all western mysticism. Both alchemy and tarot divination mentioned Kabala's tree of life.