The objective was to reformulate the old Telephone Museum, built in 1918, in Rio De Janeiro, Brazil. The project concept is the dialogue between the new and the old. The old construction was partially demolished to receive a new mass, in the back of the site, defining three zones in the building: the volume formed by the old building, that was kept with its peculiar characteristics; the new volume, that is different from the old, by a contemporary architecture; the empty, formed by the space between the two masses, keeping a harmonic dialogue between the parts.