I watched [a video][1] showing an orange solution that goes to clear and then back to orange (and so forth.) The reaction goes through a number of cycles before it will no longer oscillate. This tells me that the overall energy in the system dissipates over time, but how does such a reaction *work*?

What is happening that causes this oscillation in concentration?


  [1]: https://www.youtube.com/watch?v=uWh8reiXq58