What dimensions are time crystals described as having?

[blackraven]

I read this article: http://www.sciencenews.org/view/generic/id/338500/title/Crystals_may_be_possible_in_time_as_well_as_space

What dimensions is the article talking about? Doesn't everything have a fourth dimension, time?

 

[DennisN]

Found another one here: http://www.technologyreview.com/blog/arxiv/27583/. Interesting article. From what I gather it involves time, as well as space. A quote from the article:

"Of course, there will be disputes over some of the issues this raises. One of them is that the motion that breaks time symmetry seems a little puzzling. Wilczek and Shapere acknowledge this: “Speaking broadly speaking, what we're looking for looks perilously close to perpetual motion.”"

If so, I fail to see how they will be able to interact with the crystal without slowing it down. But I might be missing something .