A Review of The Discarded Image by C S Lewis

I recently finished The Discarded Image by C. S. Lewis. This book was published in 1964, one year after the author's death. This book has been described as Lewis's masterpiece. I agree with that assessment.
All that said, here are few things of particular interest, that Lewis talks about in the book.
1. Despite Medieval man's illiteracy, he knew more from the books than do many today.
2. Medieval man knew more about geography than modern man usually gives him credit. For example, navigators did not see Jerusalem as literally the center of the earth despite the fact that maps often portrayed it as such. Maps were meant to be more artistic than entirely realistic. 
3. Medieval man valued the earth more than many do today. People in the Middle Ages spent many long hours outside.
4. Medieval People did not distinguish History from stories. That is why Medieval historical account often mention mythical stories as their origins. It is also interesting to note, that many medieval English people, believed they were descendants of the Trojans. This theory, perhaps is largely attributed to Geoffrey of Monmouth's History of the Kings of Britain.
5. Lewis shows his extensive knowledge of the medieval world by the number of works, people and literature he speaks of. He was certainly well read in all that he addresses.
6. Lewis demonstrates through evidence in the book, how Medieval man understood astrology.
7. Lewis goes through the Aristotelian Model of the Earth and Heavens as the main premise of the book.

 I ultimately found this book a great defense of Medieval Culture on many points. It is one of several books by C. S. Lewis on Medieval Literature.