There’s more to composition than the rule of thirds. And Fibonacci’s not an opera singer. (You’re thinking of Pavaratti — or of Bocelli — or of no opera singers because why would you be?) The composition is the frame and the arrangement of the elements in that frame. What are the elements of a frame? The mise-en-scène — everything in the frame that makes up the frame, including everything from the actors, to lighting, to props, to costumes, to composition.