Anyway, the layman's version is basically that if the number of sentient beings who perceive a version reality reaches a critical mass, that reality will physically manifest itself. i.e. if enough people believe that the Earth is the center of the universe, it will be. I seem to remember that this theory actually quantified the number of discreet conscious entities required to push that reality.
Anybody out there know what I'm talking about, and what that magic number might be?