However, I have cracked the code of this mysterious rhythm, and will present you now with my findings.
Amazingly, as bizarre at the thing sounds, it is supported by what turns out to be a very simple pattern lasting nine sixteenth notes. These are the low notes, which are spiked every once in a while by an intervening, descending high note.
Here is the pattern, and it lasts a total of 72 sixteenth notes. I suppose, then, this whole thing is in "9/16" time, but it's hard to say:
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X X X X X
X X X X X X X X X X X X X X X X X X X X X X X X
........................................................................
There are two tricks here:
One trick is that, when the top and bottom patterns "match up", only the top note is played. This is really what makes this rhythm so hard to follow. It doesn't seem like that simple a pattern, since the low note is not played when the two rhythms strike at the same time. But if you listen, the simple 9/16 pattern is maintained throughout.
The second trick is that the "top" rhythm is not consistent in its timing. After the first beat, it waits 15 beats before the next beat. But after that, it only waits 14 beats. Then after that, 15 again. Then after that, 14. And then another 14 to bring it around to the beginning of the whole pattern.
The bottom pattern repeats 12 times, which 72 (the total number of beats in the pattern) is divisible by, which is why it can remain constant.
The top pattern, however, hits five times, which 72 is not divisible by, which is why there are those two "15s" in there, so that the total (15+14+15+14+14) adds up to 72 beats.
Anyway, that's how it works. It is definitely one of the strangest, most math-intensive passages in all of rock. Not to mention kick-ass.
Thank you for your time.