What is the first object that the martian is able to describe?

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.

It was a book and the martian compared that to the Caxton.

Hope this helps !

Photon