For those multiverses in which outer planes are supposed to be infinite in extent, what happens if you keep going up into the sky, or keep going down into the earth? I've heard 3 answers, that you can't because you will stick at a certain depth or altitude, that it goes on forever, and that you will fall out of the plane and end up in a different plane. Is there a 4th answer?
I tend to play it like it takes a certain amount of perceived time to travel from X to Y and that if you go on for a while you can reach different landmarks. There are border areas with other planes but they're not exact distances from anyplace. You can get there at the speed of story. Or perhaps under certain conditions certain places within the plane exist, at other times they don't.
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Anyway, IMO, it depends on the nature of the plane. Think about (for example) the ever-changing chaos of Limbo: there, you wouldn't even know where could be up or down...
I have no idea what the official answer is, but by the definition of "infinite" there must be at least one direction in which one could travel without limit.
The people who designed the Planes in 2E and 3E didn't really seem to have a conception of what "infinite" actually means, though. If a demon lord - let's say Demorgorgon - really rules an infinite Plane, then either he has an infinite number of vassals/servants/followers, or most of the Plane has no being even pretending to be loyal to Demogorgon within a ten trillion light years (or any arbitrarily large distance one wants to pick). Either way, that seems pretty silly IMO.
Thanks
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Planescape in 2nd edition hit on this subject a bit...
Take the Outlands for example (the plane of absolute neutrality). It is infinite in size, and yet has a number of settlements that people and planar beings frequently travel to and from...
What TSR suggested, was to have the time needed to travel from one town to the next vary a little. The important thing was knowing your destination, as if you just wandered, it would take literally forever to get anywhere...
As to up/down, the city of Sigil sat atop the infinitely tall spire at the center of the plane (you just had to assume that an infinitely large place even had a center)...
Hope that helps...