Nobody wrote the rule

Before going anywhere near that, look back at how little this one ran on. Four tastes and eight bottles. That is everything it was ever given, and out of it came a rule nobody wrote.

A path across a field arrives the same way. Nobody surveys it or marks it out. Enough feet cross the same ground and the route is simply there, held in flattened grass rather than written down anywhere.

This model has a property that almost none do. You can read it. Ask why it produced a price and the whole answer is four multiplications and an addition, with each weight saying plainly what one taste is worth.

Which is a stranger thing than it sounds. Those four numbers are what the machine runs on, and they are also the entire account of what it learned. There is no manual sitting beside the machine explaining how it works. The numbers are the manual.

Real models are not like this. A large network holds billions of weights, and nobody can read them back as a sentence about wine, or about anything else. Here the simplicity is a gift. You can watch a rule appear and still inspect every number holding it.