[Mike McCarty]

I've used the above calculations to come up with the golden ratio point of interest for "El Jaleo." My calculation puts it at the point I've indicated with the red dot just above the guitar players head.

I would say that the more grand the composition, the more elements involved, the less use this measurement may be. If I apply it to the Valazquez below it comes up quite random in the upper left of center as indicated, yet, if applied to Vermeer's Pearl Ear Ring it hits the mark quite well.

And there is always the possibility that I have not applied the calculation correctly. I hope someone with more knowledge of this principle will come forward and tell what they know.