I just came across a wonderful teaching aid:
Our success in implementing the Turing Machine as a physical device is exciting because the Turing Machine theoretical construct is such an iconic part of computer science. The Robotic Turing Machine is not in itself a practical machine, but it does illustrate the theoretical points made by Turing, and so could easily find application in the field of teaching. Illustrating the theory of a Turing Machine might be made easier with a physical machine at hand to aid in comprehension. Seeing a physical machine performing TM operations can be easier to follow than the typical java applet example and might give a better intuitive understanding of the TM theory.