I read about half of it in the computer. I will buy it to read the whole book. But when I talk about GEB to my friends, I have a hard time trying to tell what

I read about half of it in the computer. I will buy it to read the whole book. But when I talk about GEB to my friends, I have a hard time trying to tell what it's about. "Err, well, a lot of things...". Then I send a link to the Wikipedia entry :)