Is There a Narrative Scientific Story of How Neural Nets Work?

It's too early to know whether there is a simple narrative. The fact that it extrapolates, you know, a cat image as being a cat image and so on,. That's more or less like what humans do is quite non-trivial. I don't know whether the reason it works that way is because architecturally, it is the same type of thing going on in the brain as is going on in neural nets.