Loved the Perfect Drug. Never got the halo thing. Die hard fans who use the halo references just confuse me, because other than the Downward Spiral which is 8, I have no idea which is which. I haven’t heard everything but I have Broken, Pretty Hate Machine, White Teeth, Fragile, Downward Spiral and White Teeth.
He’s also got “Further Down The Spiral” and a couple other “Spiral” references going.
He’s apparently into thematic/stream of consciousness stuff.
Here’s this if you wanna try and make sense of it all:
http://en.wikipedia.org/wiki/Nine_Inch_Nails_discography
I just listen and don’t question.