///I reckon consciousness is a state, not a thing, so it can't be separate from the brain. Destroy the brain and consciousness is lost. I need a volunteer and a large hammer to demonstrate this. (I happen to like cats.)///

Consciousness is outside space-time. That's why it collapses the wave function. Nothing material can do that. Anything material picks up the dichotomy, what we call a von Neumann chain. Consciousness needs the brain because that is its gateway into space-time.

////So if 100 people look in the box at the exact same moment, they will all see the same thing. Consciousness must be a unity. Therefore it is impossible that the brain manufactures consciousness or all consciousnesses would see something different. That they can only see the same collapsed wave function, the same state, each and every one, each and every time, could only be because consciousness is a unity. If consciousness is a unity, it cannot be manufactured by the brain. If it is not manufactured by the brain, then consciousness is separate from the brain.

Or... they all see the same thing because the moggy is either dead or alive and can't be both.////

That's the classical physics way of thinking and it won't hold up against quantum physics. The physical world is composed of quantum objects. It's been proven. It's indisputable. Quantum objects are just waves in potentia until specifically regarded. If you don't like that, go fight with Murray Gell-Man and David Bohm and Jack Sarfatti. It's out of my hands.

Even classical physics can throw you for a loop. Take four cannonballs that weigh a pound each. Add their weights together and what do you get? 4 lbs. Now weigh them all together at once and what do they weigh? 4 lbs. Now take a nucleon with an atomic weight of 1. Add up four of them and what do they weigh? 4. Now combine them into a nucleus--helium in this case--and what do they weigh? Approximately 3.97 or so. Yes, they weigh less as a nucleus than they do weighed separately and then summed up. That's called mass defect? How can it be? It's perfectly logical once you know the answer.