This episode might well be skipped by anyone who doesn’t like mathematical things, particularly the idea of thinking involved in three dimensions but if you’re remotely interested in what tensors have got to do with machine learning and therefore with chatGPT and large language models, it may be of interest. It’s very imperfect, and I am conscious that it may well be a bit of a peculiar episode and in the context of this series. I will come back to something much more down-to-earth episode 52.