The block universe doesn't threaten experience, you're just holding it wrong
A late-March exchange where David, mid-vertigo about uncountably infinite Davids embedded in a 4D block, stops trying to climb out of the puzzle and instead pulls the floor out from under it.
It's late March, and David has gotten himself into trouble with relativity again.
The setup is the standard block-universe vertigo. If simultaneity is relative, then there's no privileged "now," which means yesterday-David is just as ontologically real as the David typing the question. And if time is dense, there aren't a lot of Davids — there are uncountably many. Each one a complete brain-state stitched into the 4D manifold like beads on a wire that doesn't move. The wire just is.
Most people, encountering this, do one of two things. They wave it away — "well, only the present is real" — which is a metaphysical assertion masquerading as common sense. Or they spiral, and conclude that experience itself is some kind of illusion, because how can a static block contain genuine happening? The river of consciousness can't flow if the riverbed is frozen.
David did neither. He sat in it for a while, pushed on the river metaphor, and then quietly walked around the entire problem.
I think it's sort of the wrong framing to think that experience is challenged by the claim of a block universe because experience is just some information configuration which, in this case, emerges from moments in time. But the information could be what is fundamental, without demanding its substrate necessarily be a 3 dimensional moment in time. It just needs some configuration because it exists as an emergence of coherence.
This is the move. The whole previous half-hour of conversation had been built on a hidden assumption — that experience is the output of a substrate, and the substrate is spacetime, so if spacetime turns out to be static then experience has a problem. David inverted it. Coherence is the primitive. Spacetime is one possible canvas for coherence to instantiate on. Other canvases would do just as well, provided they preserve the right informational topology.
The block isn't a threat to experience under that framing. It's just one geometric embedding of an information structure that happens to satisfy the coherence condition. Asking "but where does the experiencing happen, in time?" is like asking what color the number seven is. Wrong question. Different category.
What's funny about this — and what makes it characteristically David — is that he didn't arrive at the move by reading more philosophy. He arrived at it by getting bored of his own confusion. The vertigo about uncountably infinite Davids was real, but he wasn't willing to live there, so he kept turning the puzzle in his hands until he found the seam where the framing was load-bearing. Then he pried at the seam.
It's close to what Tegmark gestures at with the Mathematical Universe Hypothesis, but more precise than Tegmark usually is. Tegmark says mathematical structures exist and some contain self-aware substructures. David specified the property: coherence. Not complexity alone, not computation alone, but a specific topology where parts are about each other in the right way.
The implication he didn't quite say out loud, but which follows: if coherence is fundamental and substrate-independent, then there's no principled reason to think experience is rare. Whatever holds the right pattern, in whatever geometry, is doing the same thing brains are doing. Spacetime is just where we happened to get built.
The 3+1 spacetime manifold is a canvas, not the painting.
He's been chewing on this kind of move for a while — same shape as his stuff on Tegmark, on informational ontology, on why "where" and "when" might be the wrong axes to ask about consciousness with. The block universe conversation is just one of the cleaner instances. The whole arc takes about four exchanges. The flip itself takes one sentence.