system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does our brain make time seem slower/faster.

I may have worded it awkwardly but I'm talking about how our brains change the perception of how fast time passes.
gpt
Think of the brain as a small child. When it is occupied, it doesn't pay attention to the passing of time, and therefore time seems to fly. When the brain is not occupied, it gets frustrated and tries to curb its boredom by watching time pass which in turn makes time feel like it's going by slower.