When Paul Rand designed the NeXT logo in 1986 he developed a proposal book for Steve Jobs, that explained the process that led him to the final design. I’m not a fan of the logo, but reading about Rand’s thinking and thought process, and what influenced his decisions, is pretty damn interesting. Damn smart designer, he was.
You can see and read scans of the booklet on Imprint. You can also find some better photos of the book on Paul Rand’s site under “Identity presentations”. Thanks Andrea for the heads-up!