We can describe the thin layer between one world and another as a preserving and finalising force, completing the transition yet remaining invisible. This border, imperceptible to most, serves as the interface where two realms merge, rendering them both "real." The work orchestrates the convergence of "virtual acoustics" and the live concert experience, weaving together an immersive blend of electronic sound textures with the unique timbres of the accordion and prepared guitar—a synthesis that aims to create a cohesive spatial sonic instrument. The 3-9-3 3D-sound projector is treated not only as a technical tool but as a musical counterpart that has the unique capacity of being both a reliable companion that supports and carries the collective activity and a dynamic, powerful catalyst, giving individual impulses and having a presence of its own.