If the PDF you're referring to is a research paper, technical report, or publication by Koji Morimoto or about his work related to the color orange and denoted as "79", here are a few potential aspects that might be covered or reviewed:

: Physical copies are famous for their unique production, featuring semi-translucent pages and fold-out sections that break the traditional art book format.

The book is a comprehensive "scrapbook" of Morimoto's career and personal artistic experiments, typically described by fans and reviewers with the following features: