There is no real solid ball.
There is just a bundle of potential (elastic) energy,
that binds itself inwards.
Likewise, there is no real solid anything else.
There are just bundles of energy,
that interact with one another.
And outward interaction is possible
only when there is constant change (Anicca),
only when there is no fixed form (Anatta).
Related Article:
Man Makes Rubber Band Ball History
http://www.cbsnews.com/stories/2009/10/30/national/main5462263.shtml