system
Given the following post, respond as if you're commenting on Reddit:
human
[Discworld] How large would Great A'tuin have to be to have a gravitational pull equal to that of earth's , and how would the field differ around him?

Assuming he wouldn't implode on himself into a spherical Turtle planet, where would the gravitational pull be strongest and weakest respectively?
gpt
Sounds like you're trying to apply Roundworld reasoning to the Disc universe, where narrativium is possibly the most powerful fundamental force in existence. Gravity is a tissue-thin against narrativium.