system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] When a person in a painting walks beyond the egdes of a painting, where do they go?

We know that painting-people can go from one painting to the other, and if you tilt a painting the people in there will slide out. Where do they go when they are between paintings? DO they have their own pocket universe there, or is it just eternal darkness between the few pockets of reality that are the paintings?
gpt
Painting in some buildings - like Hogwarts - are interconnected. The people depicted in them can enter other portraits. Like when The Fat Lady spent Christmas in the painting of the Four Drunk Monks, getting wasted.

Headmaster portraits have an additional enchantment that allows them to move freely between any portrait of themselves, regardless of its location.

Beyond that, a painting is a painting, and they can't leave its confines.