It looks like it is acting like a rattleback toy. A slight rearrangement of the case perhaps made it more susceptible to vibrations and now it is slowly spinning in one direction as it vibrates.
A brave curator can help solve the mystery by taking it out and seeing if it is easier to spin in one direction or the other and preferably rattles to a stop when spun in one direction.
On Jun 24, 2013, at 7:47 PM, Stacey Stern <[log in to unmask]> wrote:
> Any ideas?!?
>
>
> http://gawker.com/museum-cant-explain-why-ancient-statue-suddenly-starte-558100574
>
>
> Sent from my iPhone
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