Just in time for a heat wave, a book of photographs dedicated to the invention that helped millions cool off: the swimming pool. Backyard Oasis: The Swimming Pool in Southern California Photography, 1945-1982 is dedicated to decades of Californians and their pools. The book includes more than 200 photos of celebrities and regular Joes enjoying a dip in their natatoriums, and includes works by famed photographers like Bill Anderson, Herb Ritts, David Hockney, and Larry Sultan. The Daily Beast rounds up some of the book’s best photos.