I was aware when I posted it that it only shifts the posts to what measurement is.
"The collapse of the wavefunction", just doesn't do it for me.
But I think I aimed it also at this concept of certainty, what are we certain about, and why. Evolution says a species is fit for the purpose, so this "sense" of intervals of time and space must be something we "need" in order to be fit for this evolutionary purpose (supposedly to survive, reproduce and continue to evolve).
Hence, our sense of being able to measure both space and time is an advantage to our survival, but that's all. So we are "certain" about it in a necessary way.
What then, are we doing when we observe a simple pendulum "in motion"? We see it moving in one, then the opposite direction. We see it has two mutually exclusive limits of motion. What we don't see is the continuous path (the swinging weight doesn't "leave anything behind it" in space).
Dumb question #1: why don't we see the continuous path?