When our group first entered the Whipple Science Museum, several of us noticed this odd shape rocking in the first display case. One of the other women muttered that it started to move when we walked into the room. I think the vibrations made by all our heavy steps disturbed it.
It was beautifully mesmerizing to watch as it rocked silently in the case.
Here is a video, and sorry about the reflections so bear with them.

What do you think? Can you find out more about it?