These vibrant Mélanges bring together texts by colleagues and friends to celebrate the life and work of an exceptional scientist, Jean-Loïc Le Quellec. Through the diversity of its contributions, this book bears witness to the transdisciplinarity, rigour and benevolence that characterise this great scientist. From epistemological reflections to scientific studies, memories, drawings and poems, each author makes his or her own contribution to this passionate and fascinating figure. This collection is an ode to curiosity, open-mindedness and scientific rigour, values that Jean-Loïc Le Quellec has passionately defended throughout his career.