I’m at a loss as to how to describe this. On the face of it, it’s a book about painting with wax, but open it at random and you’d be hard put to spot that because there are so many other techniques and media involved. The best thing I can say is that it’s a whole new craft in itself and I haven’t seen anything like it before (and I don’t think I’ve led that sheltered a life!).
Find a copy. See it for yourself. If new ideas and methods appeal to you, I think this could keep you busy for a long time to come.