The beauty of this form is that is made from a single piece of paper.
also it has pockets. and you’ve gotta love a pocket.
I’ve made this one out of an old calendar, and the pocket inserts are magazine pictures, mostly of books which i had saved (at one point i was using a lot of magazines for collages, and the bookshelves made interesting and pleasing patterns of ribbing see recent ones here)
the images are here