Who would know better how machines dance than a machine itself? Fortunately, "Alexis" is a machine - at least according to the human inventor Horst Grabosch. What we see as a pure function of robots is apparently a ballet from the machines' point of view. The machine simply thinks up the appropriate music for it, because how bass and horns stimulate the human's dancing leg is no secret to artificial intelligence. The result is a trance-like dance track that would fit in any dance club in the world.