Nitpick: Egan&#x27;s design is different in principle; it&#x27;s a self-contained device running a bog-standard neural network that, over a number of years, trains itself on the brain&#x27;s inputs and outputs. So the actual mechanics of how it operates doesn&#x27;t necessarily reflect the structure of the biological brain.<p>I found that really fascinating as an idea. Being identical is one thing, but does being arbitrarily close to your behaviour make it you?