Hmmm… small isn’t exactly the right concept. Maybe… shattered?, or dissociated? Continuing to model causality as ripples spreading from events, we can remember that there are countless events happening all the time at various scales. Spacetime, after all, is famously big. As those ripples propagate outward, they meet other ripples and the properties of the causal (let’s borrow a term:) field at that point become informed by all of the incident ripples. Eventually, the movements of the field are no longer distinguishable as ripples (at a certain scale) and appear as fully random background noise on which are superimposed more identifiably ripple- or wave-like patterns on larger scales from newer perturbations that are still more coherent. The random-looking movements show up on the smallest scales possible (yes, the Planck scale), while the still-more-coherent events show up on scales more like the ones we can directly observe, e.g. meters in seconds or light-years in… well, years.
Hmmm… small isn’t exactly the right concept. Maybe… shattered?, or dissociated? Continuing to model causality as ripples spreading from events, we can remember that there are countless events happening all the time at various scales. Spacetime, after all, is famously big. As those ripples propagate outward, they meet other ripples and the properties of the causal (let’s borrow a term:) field at that point become informed by all of the incident ripples. Eventually, the movements of the field are no longer distinguishable as ripples (at a certain scale) and appear as fully random background noise on which are superimposed more identifiably ripple- or wave-like patterns on larger scales from newer perturbations that are still more coherent. The random-looking movements show up on the smallest scales possible (yes, the Planck scale), while the still-more-coherent events show up on scales more like the ones we can directly observe, e.g. meters in seconds or light-years in… well, years.