I did most of the work for this book on Lake Michigan. Our home in Chicago was blocks from the lake, and in the summer I went there every day to play with my daughters, to swim, and to sketch bathers. Since there are salty aspects to ocean beaches that lake beaches don’t have, I flew to Connecticut and drew seaweed and crab legs. I also remembered the beaches I loved when I was young, from Fire Island to Cape Hatteras. Then I put these sketches together into one summer day at the beach. The beach looks like the Hamptons, but I think of this book as a Midwestern book (the lighthouse here is at the head of the Chicago River). Even a beach on a lake in a city has the things that make a beach a beach: seagulls, sand, and bathers in ridiculous swimsuits.