system
Given the following post, respond as if you're commenting on Reddit:
human
If a photon doesn't experience time or distance, why isn't everywhere constantly light?

That is to say, how come we can observe light as something that changes?
gpt
A photon doesn't experience time (or anything, really). This doesn't mean photons don't move or anything. It just means there's no sense in which they have *experience*. But we do experience those things, and we see photons moving at the speed of light, as normal.