At around 4:15 into Triad the background atmospheric music sounds just like the music of Set the Controls for the Heart of the Sun by Pink Floyd. It makes sense too, Triad being the Sun, while Disposition is earth, reflection is the moon. All three make a triad.
Admittedly this really has nothing to do with Tool, but I saw the Smashing Pumpkins a few months ago and they played Set the Controls for the Heart of the Sun. It was a very good, spacey cover and they jammed on it for close to 20 minutes.