But there’s more to this story. We’ll talk about it a bit more formally in the next section. But the basic point is that so far we’ve just talked about picking reference frames in a “spacetime causal graph”. But ultimately we have to consider the whole multiway graph of all possible sequences of update events. And then we have to figure out how an Observer can set up some kind of Reference Frame to give them a perception of what’s going on.
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> We also correlate things we do with the reaction observed in the environment we live in. The way we walk maintaining our balance on various types of ground depends on how the pressure felt on our feet is correlated with our estimated speed and acceleration in 3 axes. Many things, some trivial such as how we pick up the phone and dial a number, some fundamental such as the way in which we have learned to speak, or to whistle, or to sing, depend on the Feedback we obtain from our Environment. The precision with which this is done makes our everyday life a huge circus act. (See “This Side Up”, episode 2 of the BBC series “The Real Thing”, by James Burke.)
In order to take a look at our problem from the first Distinction, we have to cross the Boundary the first distinction represents in a controlled manner.