“As you enter the Louvre, big, clear signs in several languages inform you of the museum’s rules. There is to be no running, no use of mobile phones – and no flash photography. This ban could not be more clearly announced. No one can miss it. Yet in front of the Mona Lisa, one camera flash after another blasts its ugly reflection on the glass protecting the painting. I just don’t understand how the Louvre can allow this destructive camera abuse. “