system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why is it so hard for humans to draw straight lines?
gpt
All your joints have to pivot in sync to make the end of the pen you're holding move in a straight line. Because there's only one way for them to be in sync and so many more ways for them to not be, it's easier to draw a crooked line compared to drawing a straight line.