This poster was printed (in A0 format) for the 2015 Science Fair in Marseille. It illustrates the mathematical process of transmitting digital messages and the different step in that transmission. Visitors to the mathematics booth were greated by this poster at the entrance, and then invited to explore seperate workshops, each explaining one of theses steps through some games and activities. The cartoonish poster tells the story of three geometrically shaped characters : Boulz (the circle), Trigo (the triangle) and Quadric (the square).