On Sunday 11 January, French citizens were joined by world leaders in a solidarity march paying tribute to victims of Islamist militant attacks in France. One photo taken by Reuters photographer Stephane Mahé quickly became a powerful and symbolic image, circulating widely in France and drawing interest from local newspapers, radio and television programmes. Today, this picture will be displayed on the front wall of Centre Pompidou to remind people of the spirit of fraternity that has recently emerged. The picture is called “Pen leading the people” as a reference to the famous painting of Eugene Delacroix: Liberty leading the people, in 1830.