Structure. An integrated circuit is just doped silicon, but understanding its chemical composition tells you practically nothing about how it actually works.
This "chemical composition" is like reading packets off a broadcast network. It's not the full state, but it's good enough to reverse-engineer what's going on at a high level.
Blood work, including blood neurotransmitters and hormones, can tell you a lot about someone's state of mind specifically because of this.
Blood work, including blood neurotransmitters and hormones, can tell you a lot about someone's state of mind specifically because of this.