Amazon. It is a really great book. Here is a brief overview: a young boy sees things that others can not see. He imagines animals in the shapes of clouds and in the bumps and crevices of his cave walls. No one else seems to see the world as he does. He begins to draw on the cave walls of his home to help others see as he sees.
I plan to use it for a Native American unit but it could just as easily work for something about the Caves of Lascaux. I can't wait to share this one with my students.