Then I showed them the cave I made for them! I hung some crumpled brown paper from our dining room table, and then I covered that with a blanket to make it a little darker and more cave like.
I gave them brown, red, and orange paint to represent the more natural colors they would have had access to, and then let them paint their own stories on the cave walls. At first they complained it was too dark, but I reminded them that caves would have been dark since they didn't have light or even fire!
They went on to paint animals, people, tracks, and hand prints all over their cave walls.