Center of gravity (toy) objects.

Moments, and Center of Gravity for Various Objects. Leaning Tower of Pisa: Add the top story and the tower falls over Glass Flask with Lead Weight: Tilt flask any direction and flask goes back to vertical. Horse rocks to and fro but does not fall off stand.
UCB Index: 
A+60+32
Demo Diagram: 
Demo Picture: 
Video: 

Popularity: