In the May 1 issue of the New York Review of Books, Caleb Crain has written a  richly thoughtful (and sometimes amusing) essay on American recreational photography — or what we call the snapshot, as seen in the current Amon Carter Museum exhibition, The Art of the American Snapshot, 1888-1978. Unfortunately, you need to be a NYRB subscriber to read the full piece (or pay a one-time fee).