What is something new you learned after watching the documentary?

Instructions (from professor) For Art Evaluation #3, instead of evaluating a piece of artwork with a group…you will be writing a movie review on your own. Watch the PBS video called “Building the Great Cathedrals” and write a one-page summary answering the following questions: How, without the benefit of modern tools and technology, did medieval builders construct Gothic Cathedrals? ​How was stained glass used in a new way in the Gothic era? What is something new you learned after watching the documentary?