The author draws the connection between Ancient Greek mythology and modern western society. They do this by stating that Greeks created gods in the image of humans, and also with the same traits/ humans qualities.
If you are referring to concrete and abstract nouns, then "North America" would be considered a concrete noun, as one can physically touch the earth in Canada and say, "I am touching North America". If it were an abstract noun, such as fear, one would be unable to physically interact with it, as one cannot physically touch an emotion or idea.
The new romantic capers of the knights of the time led to the popularity of romances in the Medieval period.
