poème rec. > spatialization rec. > sound routes rec. These are the sound routes that we were able to reconstruct from the constraints provided by the various sources, namely the Philips Technical Review (total of 350 loudspeakers), the photos of the pavilion interiors (for matching with our guesses), the original schema laid out by Xenakis, the electrical schemata of the routing devices. Red speakers are actually, blue speakers are guessed.