Forum Friday: Outlier Books

Have you ever read a book that did something totally different? I am thinking in terms of format specifically, but answers do not have to be limited to that context.

A few outlier books that come to mind:

  1. Cloud Atlas by David Mitchell. This book is a nesting doll of six narratives, following six characters (who are all, as an added layer, interconnected/reincarnations of one another). The really cool thing about Cloud Atlas is that it does not just go in chronological order (1, 2, 3, 4, 5, 6); it first goes 1-6 and then goes backward: 5, 4, 3, 2, 1. I have NEVER read anything like it. EVER.
  2. The Guernsey Literary and Potato Peel Pie Society by Mary Anne Shaffer and Annie Barrows. Composed entirely of letters. Guernsey Literary is certainly not the only book to do this, but it is still an unusual format worthy of note and accolades.
  3. Crank by Ellen Hopkins. Crank is one of several books by Hopkins whose narrative is told exclusively through poems. Again, there are probably other books that do this, too, but the format is something to marvel at.

What unusual novel formats have you encountered? Any books specifically that you would recommend?