How do you read a book?

The three boys sat down on our big blue chair to read a book on Andrew's Kindle.  When they started reading the book, Bauer was sitting down beside them.  Then I noticed that he was looking at the book, hanging on the side of the chair.

Then he sat for a minute with one leg up. 

Then he decided to get all the way up. 

But then again, a few minutes later, he was back to hanging on the side of the chair again.