I am writing a postcrit for every Object, and I now have come to this one. I voted it a +1, but I am a bit biased since I was one of the critics for this page. Some of the great things have already been discussed so let me reiterate them. The Infinite Book is a great story that expands Blanche's characterization in a way that makes her more human and less… Mary Sue. She makes some mistakes but her ultimate goal is to help people. Overall the expansion of the world makes sense and it feels both realistic and enjoyable. The story also illustrates it's themes very well and rereading it only furthered that fact.
Now for the things I suggest working on: the first mention of M.E.G. isn't linked, you forgot to put the final abbreviation in "A.R.O," and the dialogue feels stilted and unnatural in places.
The bad stuff doesn't take away from the enjoyment of the article, and all around is really minor.
Great article, I'm glad I got to crit it, +1
