A coffer for a valued content. This alternave highlights and enhances the existing building by proposing a new elegant lightweight perforated mass which creates a controlled contrast with pre-existent construction.Use of Light, textures and colours, cultural values, tradition, history and heritage are the basis for this contemporary design, providing the Museum with a unique, mysterious and expressive design Flexibility. This alternative proposal arrangement allows for a flexible use of the space in both ground and first level. Open spaces, capable of hosting any specific removable content as required during the life time of the building are proposed to be directly linked, enabling the extension of any of them to the other adapting the space to the exposition needs.A rich combination of heavy masonry and lightweight materials as glass and metal perforated plate and mesh is proposed, stablishing a strong relation among the container and the content.