We all knew already how helpful LEGO Technic might be to demonstrate some mathematical properties.
Yet, with this infinitely simple construction we get also a demonstration from the chaotic behavior of the Double Pendulum.
In mathematics a double pendulum is a pendulum with another pendulum attached to its end, and is a simple physical system that exhibits rich dynamic behavior with strong sensitivity to the initial conditions.
The motion of a double pendulum is governed by a set of coupled ordinary differential equations. For small angles, the double pendulum behaves like a linear system. However for large angles or certain energies, the double pendulum is non-linear and its motion turns chaotic.