Hand Tools Archive
Yeah, I know a guitar guy, a serious guy who teaches and makes all his money from Classical Guitars, and he is obviously a numbers nut, and he had a whole large format sketch book, full of explorations of the guitar's shape in relation to Phi. Which is not particularly surprising given that there is no relationship that we know of between the various shapes, and the musical capacity of the instruments, therefore whatever looks good to you... And of course, designers back then were very formally trained.
I like Bill have had difficulty using it on stuff like furniture. most of the things I like are certainly not one ratio, and probably not 1x2 versions of it, but I would have to give that a check. Of course if you parse it enough, you can probably come up with almost any shape.