  Maxwell demons are creatures that are imagined to be able to reduce the
entropy of a system without performing any work on it. Conventionally, such a
Maxwell demon's intricate action consists of measuring individual particles and
subsequently performing feedback. Here we show that much simpler setups can
still act as demons: we demonstrate that it is sufficient to exploit a
non-equilibrium distribution to seemingly break the second law of
thermodynamics. We propose both an electronic and an optical implementation of
this phenomenon, realizable with current technology.
