[d4rkn0d3z]

It is interesting that we can measure absolutely every physical quantity in units of length and that our best gravitational theory is based on manifold curvature characterised by an infinitessimal line element. This suggests that ultimately the universe may be geometric in nature with, at least from our perspective, a fundamental length (area) scale at which very simple geometric rules operate ad infinitum to produce all of the emergent complexity we observe. On this view, we live in a fractal, we are patterns at scale that do not appear to arise obviously from the fundamental rules, but we do so arise.

The above entails that the speed of light is not quite constant, but rather energy dependent; c=f(E). The variation would be very small so detecting this is challenging. Myriad observational hurdles may prevent us from ever detecting such small variations but there are many reasons to posit such a model, most quantum gravity theories do so.

[fellowniusmonk]

Pretty sure we just need a clock.

State change/differentiation exists, that's what we can't get rid of in the physical world no matter how hard we try.

https://www.nature.com/articles/s41598-024-71907-0#Sec8

[d4rkn0d3z]

Time can also be viewed as a length.

[pavel_lishin]

> It is interesting that we can measure absolutely every physical quantity in units of length

Can we?

[d4rkn0d3z]

Yes of course, not only can we but it makes everything so much easier.