White Fountains [Digest urth.v007.n008]

It's my understanding that white holes aren't permanent, as they rapidly "fill up" their neighborhood with matter, thus driving a collapse into a black hole. I'm not a physicist, so I may be wrong, or it might depend on the rate, etc. However, if I accepth the physics, I'm still puzzled by the odd use of "higher" and "lower": the natural use of the terms would have matter/energy falling from a higher universe to a lower one. In the higher universe this is a black hole; in the lower universe it is a white fountain. Is the use of "lower universe" as the source of the White Fountain in the books? Could one of the Kabbalahists on the list please list the worlds and their relations? -John