An Eco-acoustic Theater is a truncated-spherical architectural structure appropriate for listening three-dimensional reconstructions of authentic natural soundscapes and eco-acoustic compositions. It is comprised of: a support structure that holds an external soundproof covering and an internal sound absorbing paneling; terraces of cylindrical concentric steps with decreasing or increasing diameter going upwards, built on grating; an annular screen placed onto the internal surface as to surround the terraces; loudspeakers embedded inside the support structure which convey distinct sound signals towards the terraces to reconstruct three-dimensional soundfields of acoustic ecosystems of primary rainforests (recorded or in streaming); projectors fixed to the said support structure to cast towards the said screen a real-time spectrogram of the average sound signal emitted by the loudspeakers.