Sorry, I confused ball bearing manufacture with lead shot, cf
http://en.wikipedia.org/wiki/Shot_tower
http://en.wikipedia.org/wiki/Ball_bearing

The second link has a very good animated gif that does double duty explaining why the hunter never circles the squirrel.;)

No, it doesn't.

But the hunter does circle the squirrel.

Doesn't he?

no, he does not. He and the squirrel both circle the tree, however.

If the squirrel's circle is smaller and inside the hunter's, then yes he does.

But the squirrel's circle is not inside the hunter's circle in this case. The squirrel is not stationary, he moves with the hunter.

Yet it is, as the squirrel is "fixed" to the tree and the hunter circles the tree.

The squirrel is not fixed to the tree, it is moving around the tree at the same rate as the hunter.

The squirrel is ON the tree. The hunter circles the tree.
Therefore, the hunter circles the squirrel.

Where's Pie when we need her?

mmmmm... squirrel pie, yum yum!

no matter - it is ON the tree and the hunter circles the tree.

The hunter completes his circle and the squirrel has been inside it the entire time

The tree is irrelevant

OK, back on topic ... Where is this?

Gray squirrel, multiflora rose, and hemlock? = PA