I’m not even going to try and pronounce this guy’s name! Flow speaks to the feeling we have when doing something we enjoy and attempts to explain it in more detail. Ultimately it seems to boil down to the enjoyment you gain from the act itself rather than the results. So, for example, you make gain some pleasure from reading a book but flow is only achieved from the act of reading itself. There are lots of examples littered throughout the book (all of them far better than my rather poor attempt just then). It’s an easy read and an interesting argument but perhaps a few too many examples to explain a point you’ve probably already got.