CAMOUFLAGE AT THE LOUVRE

THE PALACE BEGAN AS A FORTRESS BUILT INTO THE RAMPART, FORBIDDING INVADERS ACCESS TO THE RIVER

          The Very Rich Hours of the Duke of Berry, October (upper level), 15th century / zoom

A magnificent trace of that wall remains, which until 2020 projectors highlighted:  

Then it became part of an installation...  

From which incomprehensible phrases spring out:

"Light brings us more deeply into auto-reflexion"

Since the majority of visitors are foreigners who don't read French, such obscurantism does not matter too much.

French people may stop, try to decipher the messages, lose interest and move on, or like these Girl Scouts pay no attention at all:

The exit leads from gloom to light,

 that is, to a McDonald's and a souvenir shop:

The rempart disappears.

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For how 

 

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Next,

Commerce is not the reason for such change.