Algodoo

A softbody made of circular cells bounded with a hard shell. It has a few interesting properties:

1. For however many circles are on its shell, they will eventually become equidistant. For example, 4 circles will be spaced out as the points of a square, 5 circles as the points of a pentagon.

2. Its inside is very interesting to look at. It is not too short of the beauty of real cellular life.

3. For the same reason as the 2nd, which is that it relies on gravitational attraction to stay together, it does not work well with other objects. In fact its shell is only a collection of other objects. Using planes and touch to manipulate it is the only real option...