Assume for a second that we want to map out some landscape and discover the surroundings.
Any information we gain about the terrain needs to be unifiable if we're to see it as a whole. This fundamentally requires that some origin exist and everything can be tied together relative to that point (in the case of physical experiences this would be an observer).
Any motion away from such an origin needs to be able to return, otherwise the results of that are not known and we could see this similar to operations that are reversible.
In information theory, we can collect information from an environment and perform various transformations upon it (which in many ways is the same as adding information to it in the context of a memory of what operations have been preformed on it), but if we remove some of that information, it isn't recoverable and that's an irreversible operation.
If we assume all structures in time determine rigid cause and effect relationship across time, then these need to all arise from reversible operations in time, otherwise the manner of getting to a moment is not determined by the past and has no such "provable" bidirectional cause and effect structure.
This reversibility is observed in physical laws and has been (in a sense, ironically) seen as a conundrum in physics as it doesn't correlate with the perceived directionality of time inherent in conscious perceptions.
Quantum mechanics could be showing us the existence of unidirectional and effectively creative and non-deterministic (at least from our perspective) events in time.
Let's generalize upon what reversibility and irreversibility are:
If we have some set of states (such as a list of potential decisions we can make) and we correlate these with some subsequent state (such as a result of an action), then if there is a way to return to the initial state we can integrate that subsequent state as a potentially valid result we can provably reach (for example, if we drop an apple, and it falls on the ground and we can return to a state in which we can, once again drop the apple, then we can assume we can continue to drop apples and prove they fall and repeat the "experiment" any number of times to build confidence in the result).
On the other hand, if we have a transition to a state that we cannot return to, then this transition only occurs in one direction and the information regarding those pathways isn't seen as a determinable structure to that initial state - it's a figurative leap of faith.
With regard to a "Theory of Everything" for science, this would appear to place it in the context of potentially all operations for which information is conserved and a return to an origin(al state) can be constructed, though additionally in the context of science as a social institution we could potentially need to restrict this further to the set of processes that can both return to an origin as well as those processes that can be used to bidirectionally communicate information regarding those, between multiple observers, with some measure of statistical confidence (and as usual, when we try to integrate multiple perspectives things become uncertain).


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