system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 what the phrase "turtles all the way down" means?

I read the Wikipedia article but.. I still don't really get it.
gpt
It's a joke. An old woman is convinced that the world sits on the back of a giant turtle. Underneath that turtle is another turtle, and so on. It's turtles all the way down.

It supposed to represent someone being presented with a gap in their beliefs and instead of questioning those beliefs, they double-down.