"Exactly. Word of Galileo’s brotherhood started to spread in the 1630s, and scientists from around the world made secret pilgrimages to Rome hoping to join the Illuminati… eager for a chance to look through Galileo’s telescope and hear the master’s ideas. Unfortunately, though, because of the Illuminati’s secrecy, scientists arriving in Rome never knew where to go for the meetings or to whom they could safely speak. The Illuminati wanted new blood, but they could not afford to risk their secrecy by making their whereabouts known."
Vittoria frowned. "Sounds like a
"Exactly. A catch-22, as we would say."
"So what did they do?"
"They were scientists. They examined the problem and found a solution. A brilliant one, actually. The Illuminati created a kind of ingenious
Vittoria looked suddenly skeptical and slowed. "A map? Sounds careless. If a copy fell into the wrong hands…"
"It couldn’t," Langdon said. "No copies existed anywhere. It was not the kind of map that fit on paper. It was enormous. A blazed trail of sorts across the city."
Vittoria slowed even further. "Arrows painted on sidewalks?"
"In a sense, yes, but much more subtle. The map consisted of a series of carefully concealed symbolic markers placed in public locations around the city. One marker led to the next… and the next… a trail… eventually leading to the Illuminati lair."
Vittoria eyed him askance. "Sounds like a treasure hunt."
Langdon chuckled. "In a manner of speaking, it is. The Illuminati called their string of markers ‘The Path of Illumination,’ and anyone who wanted to join the brotherhood had to follow it all the way to the end. A kind of test."
"But if the Vatican wanted to find the Illuminati," Vittoria argued, "couldn’t
"No. The path was hidden. A puzzle, constructed in such a way that only certain people would have the ability to track the markers and figure out where the Illuminati church was hidden. The Illuminati intended it as a kind of initiation, functioning not only as a security measure but also as a screening process to ensure that only the brightest scientists arrived at their door."
"I don’t buy it. In the 1600s the clergy were some of the most educated men in the world. If these markers were in public locations, certainly there existed members of the Vatican who could have figured it out."
"Sure," Langdon said, "if they had
"Camouflage."
Langdon was impressed. "You know the term."
"
"Okay," Langdon said. "The Illuminati used the same concept. They created markers that faded into the backdrop of ancient Rome. They couldn’t use ambigrams or scientific symbology because it would be far too conspicuous, so they called on an Illuminati artist—the same anonymous prodigy who had created their ambigrammatic symbol ‘Illuminati’—and they commissioned him to carve four sculptures."
"Illuminati
"Yes, sculptures with two strict guidelines. First, the sculptures had to look like the rest of the artwork in Rome… artwork that the Vatican would
"
Langdon nodded, feeling a tinge of excitement, talking faster now. "And the
"
"Not in the 1600s," Langdon reminded her. "Early alchemists believed the entire universe was made up of only four substances: Earth, Air, Fire, and Water."
The early cross, Langdon knew, was the most common symbol of the four elements—four arms representing Earth, Air, Fire, and Water. Beyond that, though, there existed literally
Vittoria seemed mystified. "So this Illuminati artist created four pieces of art that