This animation is based on my publication Maxwell's Demon Is Foiled by the Entropy Cost of Measurement, Not Erasure, https://www.mdpi.com/2673-9321/5/2/16 (preprint version: https://philsci-archive.pitt.edu/25388/) https://videopress.com/v/WqIS0pYm?resizeToParent=true&cover=true&preloadContent=metadata&useAverageColor=true The Demon gets ready to violate the 2nd Law, but is in for a surprise!