system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why does light instantly disappear and not linger.

We all know that light are like small waves or particles in a stream, so if I were to turn off the lights in a room, why do they all suddenly disappear and make the room dark instantly instead of the room going darker and darker until it's pitch black?

Like a fade from light to dark. Is it happening so quick that we can't see it or is my understanding of this wrong.

Edit: sorry if this is kinda long winded.

Edit 2: Thank you to all the replies. I now understand why, seems as though it IS too quick of a process to be seen by naked eye  :)
gpt
Cause you don't really see the light itself, you see what light reflects off of.  That, and the fact that light is pretty much the fastest moving thing in the universe.  Cut the source of light and it appears to be instantly gone but there really would be a period that light phases out, it's just the transition is too fast to be detected by our eyes.