The kid and I are going to be using natural pigments to paint on rocks (sandstone) while watching whatever I can find about cave paintings, in specific so it can wear off and I'm super excited about it because I get to teach this lesson, "Use this as a chance to demonstrate how fragile these creations can be, how amazing that there are remnants existing from when we first evolved, and how important it can be to protect such artifacts, because when they are gone, they are gone forever."