A book was the first ever object that the martian was able to describe. The book was compared to the Caxton. The martian described the Caxton as having a lot of wings and the wings serve as the pages of the book.
Hope my answer has come to satisfy your query.
Personally, I would phrase it like this:
The choir moved the audience to tears with their beautiful voices.
Circle turned the men into pigs
In a cave ? because thats where they are in the movies and in real life.
