The scene went from bad to worse. The camerlengo’s torn cassock, having been only laid over his chest by Chartrand, began to slip lower. For a moment, Langdon thought the garment might hold, but that moment passed. The cassock let go, sliding off his shoulders down around his waist.

The gasp that went up from the crowd seemed to travel around the globe and back in an instant. Cameras rolled, flashbulbs exploded. On media screens everywhere, the image of the camerlengo’s branded chest was projected, towering and in grisly detail. Some screens were even freezing the image and rotating it 180 degrees.

The ultimate Illuminati victory.

Langdon stared at the brand on the screens. Although it was the imprint of the square brand he had held earlier, the symbol now  made sense. Perfect sense. The marking’s awesome power hit Langdon like a train.

Orientation. Langdon had forgotten the first rule of symbology. When is a square not a square?  He had also forgotten that iron brands, just like rubber stamps, never looked like their imprints. They were in reverse. Langdon had been looking at the brand’s negative !

As the chaos grew, an old Illuminati quote echoed with new meaning: ‘A flawless diamond, born of the ancient elements with such perfection that all those who saw it could only stare in wonder.’

Langdon knew now the myth was true.

Earth, Air, Fire, Water.

The Illuminati Diamond.

— Dan Brown, Angels & Demons