From experience to sound experiments, from personified story to active demonstrations, our prospective approach about creative atmospheres tends to leave the simple approach by phenomena of a sound which brings back to the immediacy, for a wider listening situation by relative position. This concept is based upon notions of distance, spacing, decay time, audio dynamic range, ear and vision synchronisation. For us, the space experiment is a universal method of polysensory attention to think the coming architecture in terms of listening variations. The example of the tomorrow Epidaurus sketched in conclusion allows to program and design a more participatory and flexible architecture.