Over on David Scrimshaw's blog, David Scrimshaw's Blog, Milan posted a link in a comment to a photo of a binder clip sphere.
The photo was posted on boingboing following a post by the sphere's creator, Eduardo Ballestero, on Reddit:
He says on Reddit that it's sturdy enough to toss back and forth, though it does hurt a bit.
What a thing of beauty! If Eduardo does post the instructions as he said he would, that would be most awesome!