The noosphere is a sphere of human thought. That’s why so much of the Mirror reality is contradictory. The altercation between Sayid and Keamy occurs within a day or two of Oceanic 815’s return to Mirror LAX. So how could Sun, having been accidentally shot in the aftermath, be brought to the hospital at the same time John Locke was, when the hit-and-run by Desmond occurred a week later? (The timeline is even referenced by Ford, when he is talking to Kate at the station house.) These aren’t mistakes, rather, it shows a two-dimensionality to it all, like when the smoke monster scans someone’s brain and comes away with the memories of other people in that mass of gray matter.