In 1969, John Lennon and his wife Yoko Ono had giant poster-billboards put up around the world in various major cities featuring the inscription (in black letters on a stark white background) “War is over! If you want it. Happy Xmas from John and Yoko.” The posters appeared in Paris, London, Hollywood, Athens, Tokyo, Berlin, Rome, and Toronto. Perhaps most pointedly, one also appeared in Times Square, New York, directly across the street from a Marine recruiting center. This was right in the heart of the most political phase of Lennon’s fascinating career (the late ’60s and early ’70s).