Having squeezed beneath the security gate, Robert Langdon now stood just inside the entrance to the Grand Gallery. He was staring into the mouth of a long, deep canyon. On either side of the gallery, stark walls rose thirty feet, evaporating into the darkness above. The reddish glow of the service lighting sifted upward, casting an unnatural smolder across a staggering collection of Da Vincis, Titians, and Caravaggios that hung suspended from ceiling cables. Still lifes, religious scenes, and landscapes accompanied portraits of nobility and politicians.

Although the Grand Gallery housed the Louvre's most famous Italian art, many visitors felt the wing's most stunning offering was actually its famous parquet floor. Laid out in a dazzling geometric design of diagonal oak slats, the floor produced an ephemeral optical illusion—a multi-dimensional network that gave visitors the sense they were floating through the gallery on a surface that changed with every step.