  Statistical mechanics descriptions of the second law of thermodynamics
generally imply point-like particles driven by a dissipative overall mechanism
for their simultaneous time-evolution. As the number of involved particles
grows larger, it becomes more and more unlikely that they by itself adopt an
off-equilibrium state with lower entropy. We present a macroscopic
counterexample of the second law that repeatedly and spontaneously produces an
entropy sink, thus recurrently enables us to harvest energy that sidesteps all
the compensation interactions with the surroundings. Hence, this mechanism
extracts energy from a single reservoir. This proves true in an experiment and
is explained as a consequence of size effects, among them nonzero particle
extent that marginally amend crucial peculiarities of thermodynamic equilibrium
dynamics.
