I’m immediately convinced that this is Erik’s wedding ring, and he fiddles with it all the time with his powers. It’s like a mood ring, people can get a pretty decent read on how he’s feeling by how fast and in what direction the ring is moving.
Slow and smooth to the right — happy
Really fast to the left — ticked
Slowly to the left — you are about to die
First one way, then the other — bored, or
Quickly, to the right — Charles just walked into the room
Headcanon = integrated.
Ah ha ha ha YES