“Sala de Máquinas” (Engine Room) is an audiovisual interactive installation, which intends to reflect on the idea of the reutilization of what we have acknowledged as obsolete...in this case old modified TVs that react to sound! An electronic oscillator is connected to an open circuit, in a way that when the user touches 2 metal bars he/she himself/herself becomes the electrical resistance therefore being able to vary the frequency of sound. The old modified TVs react to this sound as an oscilloscope having all kinds of different patterns and reactions.