DA VINCI CODE 20-5
"Your grandfather," Langdon said, hurrying behind her, "when he told you about the pentacle, did he mention goddess worship or any resentment of the Catholic Church?"
Sophie shook her head. "I was more interested in the mathematics of it—the Divine Proportion, PHI, Fibonacci sequences, that sort of thing."
Langdon was surprised. "Your grandfather taught you about the number PHI?"
"Of course. The Divine Proportion." Her expression turned sheepish. "In fact, he used to joke that I was half divine... you know, because of the letters in my name."
Langdon considered it a moment and then groaned.
s-o-PHI-e.
Still descending, Langdon refocused on PHI. He was starting to realize that Saunière's clues were even more consistent than he had first imagined.
Da Vinci... Fibonacci numbers... the pentacle.
Incredibly, all of these things were connected by a single concept so fundamental to art history that Langdon often spent several class periods on the topic.
PHI.
