Why one past? Quantum theory is very successful in describing bits of matter as clouds (probability distributions). Ironically, it is the proximity of one cloud to another that constrains the shape and size of each cloud. These constraints pile one upon another, ultimately constraining the quantum world until on large scale it becomes the world of our everyday experience. However, quantum theory says that underneath it all, the quanta are ultimately unconstrained. For instance, if a photon from a distant star ultimately hits a photo receptor in your eye, then in some sense that same photon did not hit your eye, or even the earth and is still flying through space. This multiple existence of quanta is the very basis of quantum computers. So it seems clear to me that our solid existence is ultimately a self-consistent set of constraints/observations on quanta. In fact, it seems that the defining characteristic of our experiential world is that all observations are consistent, whereas in the quantum world, all quanta are ultimately not consitent. Let me come back at the photon and the photo receptor in order to clarify this point: When the photon interacts with the photoreceptor, this sets off a chain of events that result in a memory of the initial quantum interaction. Such memories are self consistent. Think of it as information. Our universe is built of layer upon layer of self consistent memory or information. The memories record past quantum interactions and are built via a series of ongoing quantum interactions. Each of these interactions is consistent in terms of the interactions that preceeded it, and at the same time each of these interactions is one of an arbitrary number of possibilities. The constraints are determined by what happened in the past. Our experiential universe is nothing more than a set of information, memories of past quantum interactions. As individuals, we are nothing more than the sum of our past memories. The defining characterisic here is that all of these memories record the same past. But quantum theory tells us that there are an arbitrary number of different pasts. Why does our experiential reality choose just one? I've been trying to come up with a conceptual framework, the beginning of a mathematical description for this concept. Can anyone out there help?