At the Denver Gem and Mineral show a few years ago I found pieces of obigular granite that were too small to use.  I bought a rock from Peru, one of the three places in the world where this unique form is found, and had it slabbed.

The two pieces sort fit together and remined me of the shape of Africa.

My design consultant/wife tells me that its not possible to make a pleasing design with and even number of elements.   This design shows, again, that there are exceptions to every rule.