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Well as I mentioned in my original, I did the same sort of thing with GW back in 1995. But that's really just the equivilent of a 3D mud which only has two levels of height.
What I'm really thinking about here is a situation whereby a fourth dimension allows just as much freedom of movement as the other three (and for those pendants, this fourth dimension doesn't necessarily have to be THE fourth dimension, just an extra one beyond the standard three found in most muds).
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