Short movie « Suivez le fil! » is an editing of three sequence-shot realized with three groups of children during a workshop on the topic of signature. Starting from a primitive method of signing which can be found as soon as in Lascaux paintings, we invited the children to draw the outline of their hand while holding their look on it than looking at the paper. Drawings thus obtained were reproduced side by side on a black surface with a long white string that creates a link between the children. String is then drawn from hand to hand in order to progressively erase the shapes. This last stage is shot in a sequence-shot and reversed during editing.