Like so many of my formative listening experiences, I heard ISDN at @akajtg 's house first. I'm pretty sure I had heard Papua New Guinea already, but ISDN was the record that captured my attention and has held on ever since.
Unlike the singular, unified aesthetic of a record like Lifeforms, or the thematic development of the Lifeforms or Cascade singles, ISDN is a mess of clashing ideas. The record was assembled from livestreams done directly to radio stations (A ridiculous thing to attempt in 1994), and was sequenced to sound less like an album than a snapshot of what an FSOL live gig might sound like.
Track 2, The Far-Out Son of Lung and the Ramblings of a Madman is a kaleidoscope of industrial drums, On The Corner-era muted trumpet, guitars, and programming and it's groovy as fuck. It sets the tone for the whole record: surprising, a bit mad, beautiful and menacing and funky. I've had some of my best times laying in the dark with this record turned way up.