The mural expression did not stop with May 68: the recent demonstrations against the labor law could testify, leaving many aphorisms inspired in the urban space. Sitting in his personal collection, Yves Pagès presents 4,000 literal transcriptions of graffiti crossed between June 1968 and 2017, referenced by place, date and method of execution. From Paris to Berlin, passing through Tahir Square, the walls, for lack of ears have mostly things to say. Walls are said to have ears, but do they know that they are murmuring? Those who, since the middle of the nineteenth century, are illegally employed in leaving traces of it - with strong chalk, charcoal, felt, brush or aerosol - have understood this well: the walls challenge us. With their hard-nosed irony, their truncated hopes, their abrupt fantasy, they echo words buried in the depths of us. They carry the words which, inscribed there without destination or right of city, are delivered to all eyes and "contaminate" the public space, thus disturbing the order of speech. Yves Pagès' crazy and enjoyable textual collection - more than 4,000 urban graffiti from all over the world over the last fifty years, faithfully transcribed, dated and localized - forms an unprecedented memory. A memory of the viral joy of the good word, free political energy, tiny audacity, minor and ephemeral poetry, the margins of syntax, clumsy invention, the pleasure of the unfinished. We will be able to devour this book by respecting its chronological progress, to lose itself by idle associations of ideas, to extract from it its own anthology or, simply, to open it anywhere and to trust the only chance of a Exquisite Corpse.