Looking Glass (book)
From Allan Holdsworth Information Center
"Looking Glass - A comprehensive study of Allan Holdsworth’s improvisational ideas, patterns, scales, charts & tunings" is a 2023 ebook by John Vullo, based on his five hour video of 2022.
The book is available at John's shop: https://holdsworthpdfs.e-junkie.com/
John also talks about the book here: https://www.youtube.com/watch?v=RKr78nK9hz8