Ah, but can it re-sharpen razor blades as well as keep time?
"a spatial ring of trapped ions in persistent rotation will periodically reproduce itself in time, forming a temporal analog of an ordinary spatial crystal. With a periodic structure in both space and time, the result is a space-time crystal."
Sorry I could not resist that. It is in fact a very interesting concept, it is just that the description had a certain "new age" ring to it.