One definition of “soul” is the attention. Your attention is your soul. Invisible. Crucial. Common.

(And by “attention” I mean what you direct when you “pay attention”, what you concentrate when you concentrate and what gets jerked around when you are distracted)

(Like, you ever played one of the multiplayer shooters? Let’s say that the player is the soul of the avatar. What does it look like when a player switches avatars? What does it look like when the player is away from keyboard?)