I cracked most of the puzzle and got the way they work I am stuck trying to think what the two word phrase could be. Is there another code/cipher in the page, because I can’t think of any two word phrase that makes sense and that I haven’t tried to put into the answer box. Any hints?
Was stuck on this one for quite a bit. My Google searches kept coming back with "Landscape With Obelisk" as the name of the painting, so I thought the letters "A" and "N" were also part of the changed letters.