Max Tegmark develop a hypothese in which physical reality is equated as being a mathematical structure, and further it is proposed that every mathematical structure itself is a reality on it's own. To look up this idea, see these threads: http://en.wikipedia.org/wiki/Ultimate_ensemble http://en.wikipedia.org/wiki/Mathematical_universe_hypothesis Note that (although the form of the idea is quite new) this idea is not very distinct from the idea's of the Greek philosopher Plato. This idea has met many criticism. One important objection one could raise is that mathematical structures, as seen as information, can not exist on it's own merits, but needs to be denoted in some (material) form. Which would lead to the conclusion that at least something different then information must exist to carry the information. This would lead to the idea that reality = physical reality + information. Many other objections have been put forward, as for instance the objection that the universe is not a set or mathematical structure.