WARNING. I'm not a physicist! If there was a universe that only had 10000 photons and we observed all of them then ran the double slit experiment would we get a normal pattern or an interference pattern? If we observe a particle is that it forever in the universe that we happen to be running our tests in? If this is the case then when we run this test in 'our universe' should there not be a bias towards a standard particle distribution as some particles in the test will have been observed in the past?