L.A.R.I.D.M.E. is an interactive soundscape where the visitor, equipped with a headset and a smartphone enters a dark and empty room where he can walk around freely. Each visitor can record a vocal contribution that will enrich the space and the experience for the other participants. The contributions are added where the contributor stands in the room. The soundscape changes with the comings and goings and is built by juxtapositions, superpositions and semantic accidents creating an organic and ever-evolving space.