Check out his wood automaton that depicts the splash after a water droplet hits a body of water.
From the video description:
The object of this project was to produce an Automata [sic] that was inspired by the work of Reuben Margolin. All components were hand made the aim was to recreate the reaction of droplet as it impacts a body of water.
The machine was made by Dean O'Callaghan. Here is where you can see more by work by Dean O'Callaghan.