The statue is broken and is found in barren lands. It is a testament to the fact that no matter how powerful a person might be, he can't fight the inevitable passage of time. The contrast where he says that he built everything and the fact that the lands are desolate are a great symbol of this.
Autobiography is something that the person who really faced and happened to and biography is that some one else wrote the story of the other person not the person who faced it.
