How can we best understand how artistic interventions set human practices in motion within historical-cultural contexts? How do artistic practices interrupt and affect other practices? To what extent are artistic interventions connected with everyday practices as an interplay of both discontinuity and continuity? During the first term (2022-2026) this research project aimed to investigate these fundamental questions from the perspective of the philosophy of art, focusing on improvisation as a paradigm of artistic practice. It was divided into two subprojects: SP 1 was dedicated to interventions that are realized in and through improvisation in different everyday artistic contexts (impromptu acting, Gebrauchsmusik, jazz). SP 2 developed a concept of action shaped by interventions, and thus aimed to shed light on the connection between interventions and the reactions to them. A concept of action that takes artistic interventions and the actions they affect seriously must be freed from the question of attribution to a single subject and from the structure of temporal closure in order to understand acting as an open process.