A term I first heard used by
Moby.
Ken Wilbur also talks a bit about such things.
The Gist:
Due to the
limitations of human sensory perception, there is no real way to tell if an
objective world exists. It's the classic question of "what if the color you call blue looks entirely different to me?". Or the
tree falling in a forest, or what have you. But if enough people can experience the same thing, we can get closer to
objective reality, and thus
closer to Truth.
The tagline:
Collective subjectivity approaches objectivity.