If you're not the sort of person who becomes obsessed with your favourite artists to the extent that you lap up even the tiniest details of their biography, then read no further: this post is not for you. If, however, you get a kick out of that sort of thing, then here's what I want to talk about. Roughly twenty years ago, I found a short book that became a valuable addition to my collection of biographical materials about Picasso. It's called A Day With Picasso, and it came about when a researcher called Billy Kluver decided to track down all the photographs taken by Jean Cocteau during a single afternoon lunch session with Picasso, in the 14th arrondissement of Paris, some time during WWI. You can read the full story in his own words in the essay that prefaced the book. A brief summary: photos like this one were known to biographers and cultural historians... L to r: Kisling, Ortiz, Jacob, Picasso, La Paquerette. ... but no-one had tried to track down all the p