Cars form barricades in the streets of Paris, May 1968
The evèvenements, besides being used as the symbol of an entire generation of protest and revolutionary activity, were probably the best source of posters and slogans ever.
Sous les pavés, la plage - "Under the cobblestones, the beach!"
Boulot, métro, dodo - "Work, tube sleep, work, tube, sleep - one in six go crazy, how long can you stand it?" (Translation courtesy King Mob graffiti on half a mile of London's Hammersmith and City line in the 1970s)
Photographer unknown - email us if you are her or him.