Serious version; Everything will have its derivatives projected on another space-time interface; if the interface where this thing is located is called the "true surface", the location of the object projected on another space-time interface is called the "mirror surface". Just like a mirror, everything in the "real surface" will be projected on the "mirror surface". The "true face" is the universe and the sum of different planes. When one day, two interfaces collide, what will be the result?
Happy version: Under the "mirror" rules, as the first spirit body to form a "realm" with the help of the spirit emitted by the "true face", it is very depressed and lonely. In the world it lives in, it is the only "living" creature in the true sense.
Finally one day, it was lonely and finally came to its "true face"...