Yeah, you're seeing this right. I actually edited a photo of my rats and wrote all over it because they were so darn cute together. Posh (formally part of a pair called Pish and Posh) and Gingy spent most of their time this way when I had them :]
Two of my boys Grant and Skitty made a huge mess in their cage and then proceded to use the torn up liners as a blankie after their mischief making was done.
I have heard of people diving into books and being captivated by the adventure they found there. This is the first time I have heard of rats being taken captive by a book while out adventuring!