Being each a section of a much larger rock pattern, they do not make for complete, balanced artworks in their own right, but I find them interesting because of their shape variation.
Have you ever looked at an object, say a rock, then looked at the marks and patterns on its surface? It’s amazing what you can ‘find’.
This is a perfect opportunity for the creation of abstract art. In this case, it has meaning because it was ‘sourced’ from a natural object.
I love drawing abstracts this way.