This album, like most Tool albums, is a work of art you can't just have playing background noise. You need to fully pay attention to the complex rhythms, lyrics, riffs, etc. Pneuma is an absolutely incredible song. If you haven't seen Danny Carey play drums before, I highly recommend listening to Pneuma and focusing on the percussion, then going and watching the video of Danny Carey playing drums for this song (Vic Firth youtube channel). That man's limbs can do such crazy rhythms that just blow my mind.