Do yourself a solid and enjoy the next two minutes:
The beams seek out and outline the vaults of the huge space using a custom system of 48 computer-controlled lights. Designer Adam Heslop, who helped visualize the performance, said it required the studio to develop a whole range of new techniques.
Here’s how it was done:
[Via]
See also the Chartres outdoor light show.
Definitely worth a side trip if you’re in northern France in the summer.
The Vimeo full-screen buttons in the embedded videos would have made all the difference.