Definitely magnets moving under the table. I used to put together a ton of window displays when I was on the visuals team at an Apple Store and it was the best part of the job.
I happened to see this in Bellevue, Washington today as well. I was in a rush though so I didn't get to stop and look at how it worked. I actually assumed it was just fishing line. It served the correct purpose though of catching my eye in a store where I normally just walk straight past.
The cases are magnetic,you wouldnt be able to get that kind of fluidity with a string
I've seen this at 2 Apple shops in Vic, Aus too.
Pretty rad
The most interesting thing I've seen about Apple this past year, which is telling.
A flashy shop display is more interesting than a new programming language for the platform?
I think that says more about you than it does Apple.