How does water flow up in AFK pools?

How does water flow up in AFK pools? - Abstract background with white glassy drops

In a very basic AFK pool, water flows in a circle, but it appears to flow up, as shown below: AFK pool

Why does this happen? Is it a visual glitch, or something else?






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How does water flow up in AFK pools? - Closeup top view of wet plain white background of droplet with translucent clean still water drops of different shapes and sizes



How do AFK pools work?

An endless circling pool, also known as an AFK pool, allows the player or any player-sized mob that gets in the water to circle endlessly around the center. These are commonly used for AFK players in multiplayer to avoid getting kicked off the server.



Minecraft AFK Pool Tutorial 1.16.1 (2020) WORKING!




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Karolina Grabowska, Matthew Barra, Pixabay, Karolina Grabowska