I'll make it brief, otherwise i'd never end ... love this topic too much.
For me it was the moment I read "A Moveable Feast" That was what really started my curiosity about The Lost Generation, Paris in the Twenties, and the 1920s in general as a decade. That was the book that in a sense hooked me on what was going to become for me a lifelong love affair with those years and the people who inhabited it.
EH and his first wife Hadley, early 20s, Europe. It's about this time in his life that "A Moveable Feast" is all about.What a great book!
EH, Hadley, "Bumby" in Shruns, Austria, 1925 ( Jack Hemingway aka "Bumby was the father of Margaux and Mariel of course.)