Artificial intelligence is more artificial than we like to think. The idea that computers are like very simple human brains has been dominant pretty much since the dawn of computing. But it is critically important not to be trapped by the metaphors we use: the ways in which general purpose computers are not like human brains are far more significant than the ways in which they are. It follows that machine learning is not like human learning; and we should not mistake the things such a system does as simply a faster and cheaper version of what a human would do.