Cut-Ups Reading

Regarding the cutting and pasting of words and images, I've always been a fairly strong advocate of the right of an artist to use sources. I like the idea of not neglecting those things already in existance rather than creating new things. It's also quite important in understanding your source: disecting it in order to reverse or change its meaning will create a more deep understanding of its purpose. At the same time, I'm also somewhat neutral on the reading- I really feel like I need to see these things in action, so to speak. I completely understand cutting and pasting both visually and ligustically or just visually, but I'm not entirely clear on why artists would cut and paste solely within literature. I'm not oppossed to it; I'm not saying I think it's silly, but I'd like to see more examples of it. The paragraph of rearanged words was not enough for me to fully understand the purpose of doing this. So, my question is less of a question and more of a desire to see additional illustrations of what this reading is talking about.