The most famous slogan of the French May of 68, and probably the most repeated, read the following: Imagination to power. Everybody has heard this repeated many times as a symbol and summary of the Paris student revolt. After being repeated for hundreds of times, the sentence has been trivialized to the point that outside of its context, seems to suggest other things: hippies and provos, playful protest, environmentalism and pacifists. And yet, what the people writing it in the walls of the Sorbonne really wanted to say has little to do with pacifism, playful protests and environmentalism. With the aim of recovering the original sense of this famous sentence, I propose in this conference to make a historiographic reflexion about what was understood as power and imagination in the Paris of 1968.