Art-therapy and artistic mediation consist of accompanying people in difficulty (psychological, physical, social, existential) placed in an artistic creation position leading to plastic, audio, theatre, body and dance works. This subtle work, which takes vulnerabilities as a material, seeks less to reveal unconscious meanings of productions than to enable them to recreate themselves and to create themselves again in a symbolic way of creation. Interventions by artists, artistic mediators and art therapists now extend to the social sphere and, in particular, address the problem of contemporary violence.