[edgyquant]

I think it’s just the normal noise/lighting/etc that is always there. You just have no reason to actually notice it (it provides no benefit to e.g. a hunter gatherer) so the brain normally disregards it. It’s a fundamental property of the universe but then again so is everything else.

[singingfish]

I was thinking of noise - or randomness. It crops up in many places. When I was studying visual perception a long time ago (back during the second wave of neural networks) it amazed me what a hostile mechanism light is for actually getting a coherent signal that looks well put together (like what our brain does)