The demon is not really supposed to be magical, but instead "some physical process or machine", e.g. a future nanomachine or something. It's like a "perpetual m

The demon is not really supposed to be magical, but instead "some physical process or machine", e.g. a future nanomachine or something. It's like a "perpetual motion machine" - a hypothetical object that can be used in thought experiments. If it could be shown that creating a Maxwell's demon that creates less entropy than it reduces is impossible, then the paradox is solved. A [brownian ratchet](https://en.wikipedia.org/wiki/Brownian_ratchet https://en.wikipedia.org/wiki/Brownian_ratchet) is an example of a (failed) implementation.