I read a short story sometimes ago on Reddit, it really stuck with me but I cannot find it anymore.
The story is told by a sentient being in a universe where people have to fill their lungs in some sort of air fountains and everything in this world is powered by air.
The narrator realize at some point that the pressure difference between the reservoir and the atmosphere is decreasing and they all will eventually die or stop moving due to this. It is an allegory on the eventual death of the universe due to increasing entropy.
Does anyone know what this is?