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What is important is to understand the true boundaries of reality, not the probable boundaries of possible future events. Although boundary conditions operate on the future, they are probabilistic constraints, not absolutely determined fact. We assume that ten minutes hence, the room we are in will still exist. It is a boundary condition that will define the next ten minutes in our space/time coordinate. But we cannot know who will be in the room ten minutes hence; that is free to be determined. One may ask if we can really know that the room will exist at any future moment. This is where induction enters the picture, since in truth we cannot know with certainty. There is no absolutely rigorous way of establishing that. But we can make the inductive leap of faith that has to do with accumulated experience. We project that the existence of the room will remain a boundary condition, but in principle in the next ten minutes there could be an earthquake and this building might not be left standing. However, for that to happen, the boundary condition will have to be radically disrupted in some unexpected and improbable manner. What is so curious is that such a thing could occur.
