Reality is a curve.
That's not the problem. The problem is that there isn't as much as there should be. According to some of the more mystical texts in the stacks of the library of Unseen University - (...) - at least nine-tenths of all the original reality ever created lies outside the multiverse, and since the multiverse by definition includes absolutely everything that is anything, this puts a bit of a strain on things.
(Moving Pictures)
--[discworld]--