Existencilism is the second book that Banksy published, and is part 2 of the three mini black book series he made. Since all three of the mini black books were combined to create wall and piece, you shouldn't buy this book expecting a ton of new images, especially because they are so pricey now.
however, if you are a fervent Banksy fan or collector, it is very satisfying to have the collection of three. Plus, even though they don't have a ton of new stuff, they do have images of his work that I hadn't seen before, that didn't make it into Wall and Piece, or extended versions of stories in Wall and Piece.
Of the three, I would say that Existencilism has the most "new" material in it, with Banging your Head Against a Brick Wall as the second most (although Banging your Head is in black and white, since it was his first book and he couldn't afford color). Cut It Out has very few images in it that are not in Wall and Piece, though as I said before, if you are really into Banksy, you will probably appreciate owning it anyway.
Here are some things in Existencilism that are not in Wall and Piece:
- Modified photograph of Riot Cops
- Tagged circus billboard in Barcelona
- More tagged cars, fields, and paint bombs
- New rats
- An extended version of the Barcelona zoo story with a picture of the penguin enclosure
- A new pissing cop and a new turf war on a wall
- New bridge painting
- Better contextualization photo for Mind the Crap
- and of course, a new introduction and new emails at the back
Overall, I was very satisfied with it. If you are tight on money and can only afford one of these little black books, go with Existencilism, and get Wall and Piece for the rest of the photos.