Physical Collage in Book Covers

I am really intrigued by this style of book covers that have been built up physically using collage. It seems that if done well, like in the cover for George Orwell's 1984, it can be a really interesting way of visually communicating an idea. I think that this technique could have great links to the 'hole' idea that I have been developing, as I could rip or burn holes into paper and reveal something underneath - perhaps the title of the novel or imagery that links to the idea. I also was inspired by a previously discussed contemporary book cover that was built up from many scraps of a textbook. The overall finish was really effective and I thought that the idea would lend itself so well to collated science imagery. It seems that collage used in the way almost always reveals something underneath - I could try and break away from this tradition or utilise it for my own good.