If I've heard right, even Zone 0 was added on to the original 1-5, and has since been refined (justifiably, in my mind) to include the mental and emotional
With tongue in cheek, I'd ask why stop at Zone 6? Zone 7 could be ancient landscapes destroyed by plate tectonics, Zone 8 the surface of other planets, Zone 9 other dimensions, Zone 10 the afterlife, and on and on.
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