I am referencing this answer by Ruben Verresen to this question: Does entropy depend on the observer?
A bit down in that answer Ruben states that just being able to perceive (in theory - in your universe) the difference between the energetic balls in the right and the left partitions would enable one to extract energy - even if the partitions have the same energy distribution I assume. But I don't see how, although one comment - responding to my comment - indicated that osmotic pressure could be involved.
Could someone explain how this would work in practice?
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