a, Displacement of the tips of the two coupled oscillators over time in the z-direction. The displacement of one oscillator is represented with the orange trace and the other one with the blue trace. b, A different motion obtained stochastically after switching the LED on and off. The data reported in graphs a and b are plotted from two different sequences combined in Supplementary Video 7. The data plotted on graph a are from the first minute of Supplementary Video 7, and the data on the graph b are from the second sequence of Supplementary Video 7.