Natural circles

When you start thinking about odds, they depend on exactly what you ask. What was the chance that I would go for a walk on the beach and find this beautiful shell stuck in a rock just so, presenting these natural circles to a camera? Very small, perhaps astronomically small. But what were the odds that I would find something interesting and different while walking on a beach? Very high, because interesting is so common on a beach. In any case, I loved the circles, I loved the colours, and I loved walking on a beach.