Looking at this toy you get the impression it is moving with no apparent cause ad infinitum! It seems that it acts like a perpetuum mobile, a machine that, once set in motion, would remain in motion infinitely if it was placed in perfect vacuum and we could ignore friction connected with movement.

Now look at a different toy - the main pendulum with a magnet on both sides and two smaller oscillators (each with a magnet), on both sides of the bigger one. An additional magnet is placed in the middle of the whole 'planetary' system. The behaviour of this toy is almost chaotic - it is impossible to predict in which direction the pendulum will move.

This is because the position of the static and dynamic equilibrium are different for the smaller oscillators. In a static position they are almost horizontal, but when the main pendulum starts to move, the inertia forces do not allow small oscillators to reach the equilibrium.

In the toy to the left, which is another planetary system, the "motor" is placed in the base of the black cone and a tip of the base moves. Inertia forces cause that each ring rotates with its own angular velocity and the whole movement is hard to be predicted.