CACTOnuno torres : alto saxophonericardo jacinto : celloEditionVera Cortês Agência de Arte, Lisbon, 2009CollaborationDaniel Malhão (photography) and Gwendolyn Van der Velden (drawing).Release of the vinyl record of the recording that took place in the anechoic chamber of Instituto Superior Técnico.When propagating through a medium, sound is reflected and absorbed, giving rise to phenomena such as reverberation and echo. An acoustic anechoic chamber is designed to absorb sound waves and attenuate their energy. In this situation, all sound energy will be travelling away from the source with almost none being reflected back. In these surroundings, it would be possible in theory to produce “pure” sound, free from external noise and reverberation.