According to Science World, a double pendulum is a system in which two pendulums are attached to each other. This simple physical arrangement shows chaotic tendencies.
Math24 describes a double pendulum as an actual miracle of nature. An amazing switch in complexity is observed as the system shifts from a simple pendulum to a double pendulum. The oscillations shown in a simple pendulum are regular. The oscillations demonstrate slight deviations from equilibrium, but they are synchronized, and they can be defined using sine or cosine function. Large angles for a double pendulum, however, yields non-linear motions with more complex phase graphs, according to My Physics Lab.