The Louvre Pyramid contains 673 glass panes: 603 rhombus-shaped panes and 70 triangular panes. The figure refers to the main pyramid in the Cour Napoléon, not every glass panel in the surrounding smaller pyramids.
Designed by Chinese-American architect I. M. Pei, the pyramid was completed in 1989 as part of the Grand Louvre project. Its glass-and-metal structure forms the museum’s principal entrance and brings daylight into the underground visitor hall. The pyramid is about 21.6 metres high, with a square base measuring 34 metres on each side.
The number is frequently misreported as 666. That figure appeared in early publicity and became famous through the symbolism and conspiracy theories repeated in Dan Brown’s 2003 novel The Da Vinci Code. Louvre-confirmed modern counts give 673 panes, making 666 a popular myth rather than the accepted architectural total.
Another source of confusion is counting the smaller pyramids around the main structure or using different historical construction figures. For the principal Louvre Pyramid, the standard answer is 673, divided into 603 rhombi and 70 triangles.