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Preface Three Time-Bytes 1. Discovering Human Antiquity 2 Seeking Answers 3. Creative Illusion 4. The Matter of the Mind 5. Case Study 1: Southern African San Rock Art 6. Case Study 2: North American Rock Art 7. An Origin of Image-Making 8. The Cave in the Mind 9. Cave and Community 10. Cave and Conflict Envoi
A 2003 study studied this question.