The walls do move, on the building called L'Institut du Monde Arabe, near the Jussieu metro stop. Devices on the side of the building open and close, depending on the temperature and light. It sort of works like a camera lens. So the building moves, and that is wonderful and bizarre, and here it is:
I like the Arab geometric forms put to use like this. Reminds us of geometry's historical importance in the Arab world.
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