The transformation of the ruins of a mansion from the 1920s and protected by the INBA into an ephemeral gallery during ART WEEK 2023 The in-situ installation in a ruined structure from the last century reveals the ephemeral qualities of the material and its form, the passage of time and the permanent condition of mutability that invites us to reflect on our relationship with architecture and its material and lighting condition. Respecting the original structure, a shade net, plastic canvas, henequen rope, wood, nails, and screws were placed in the minimum to be able to provide a play of light