The author begins the book by really laying the context of how our ancestors may have seen the Earth and universe. Think about it... How would not having writing effect how you think and even imagine the world around you? How would you solve problems without the formal math of today? I rarely see a historical survey start with first setting the stage of the actors of the time period in question. We so often take for granted that they are like us today, just without 'stuff' of modern convenience. Chances are, our ancestors thought, related and felt ALOT differently then we do today. This approach adds an authenticity to this book that is captivating and authoritative.