Sand Pendulum for Desk/Table. NIB! From ThinkGeek.

New in Box! Sand Pendulum from ThinkGeek. Never used. Purchased from ThinkGeek. I opened it up long enough to take a pic and video of the contents. The Sand came inside its own ziplock bag, but I put it inside another bag to ensure it’s secure. Please see pictures as on the side where the closure /opening tab is, the cardboard is bent. Place it on table or desk, and witness the beauty of gravity and momentum at work or home. The magic of a sand pendulum has been studied for centuries. Perfect for anyone fascinated with gravity and momentum. Nice for an office as a stress reliever.