Chaotic dynamics actually involve patterns, coherence, and order. Appear to be random, but exhibit deep and subtle patterns of behavior. Extremely sensitive to their initial conditions. There is order in apparent randomness. It only takes a very small change to render a system chaotic, or conversely bring order to chaos.
Nature is composed of mirroring echoes of non-linear events.
Butterfly Effect A minuscule change in the initial condition or starting point can drastically change the long-term behavior of a system. Essentially, small changes can result in large differences. The flapping of a single butterfly's wing today produces a tiny change in the state of the atmosphere. Over a period of time, what the atmosphere actually does, diverges from what it would have done. So, in a month's time a tornado that would have devastated the Indonesian coast doesn't happen.