I am not a Pink Floyd fan. There are a few songs here and there that I tolerate but on a whole I just have never dug them. I actually found this song through Pandora via a channel I seeded with Radiohead.
I think I dig this one because it has no vocals except at the very start cluttering it up. Its just a bunch of trippy instrumentals playing over on another. You can sit back and focus in on one particular instrument or you can relax and let the wave of strange wash over you.
If I had to sum it up, its like a musical palate cleanser.