I have a Laymans understanding of this subject but here goes... I'm sitting now in my living room looking at the fireplace. My act of observation (photons bouncing of the electrons into my eyes) cause the wave function to collapse and create the reality of the fireplace. I now turn my back to the fireplace and for all intents and purposes it does not exist now, since my non observation means the wave function remains un-collapsed. I turn back again and observe the fireplace, the wave function collapses back into the reality of the fireplace. My point is this, on turning back to observe the fireplace time and time again, why should the wave function always collapse back in exactly the same manner and produce for me the reality of a fireplace? Is it simply that the molecules of the fire place retain a structure in which the wave function can collapse?