I rather like the fish tank analogy. When placed side by side Space would appear infinite but actually be quite finite. Observation only would be a poor predictor of size as that you would peer into other Universes without ever realizing there existed a barrier or that the other side of the other "Verse" had different properties much like a fish would feel outside of it's Universal tank and in Ours. Just a thought. However,this could also partly explain how particles such as photons could travel and bounce back and forth between as if no barriers existed in the first place.
More information about formatting options