WOD: stones/rocks ... My naturalist is youngest son, and among his love of nature was a passing interest in rocks. We even had a rock tumbler, though it was small and it took a week to polish just a few stones. So when we visited local museums he would pick out a small bagful of polished rocks and bring them home. It was fun pulling them out and looking at all the colors, particularly when the sun graced me with a bit of evening light.