I see microphone capsules everywhere...

[12afael]

Weird... Maybe it is the biggest microphone ever haha.

 

[cyrano]

It's a famous housing project in Paris, for those interested:

https://themindcircle.com/les-arenes-de-picasso/

 

[Matador]

That's one hell of a replacement mylar, and tensioning must be a real pain with all of those people pushing on it from the back side.

It does resonate at 0.0001Hz so bandwidth isn't an issue.

 

[JW]

Will need a windscreen of course.