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There were no photography signs everywhere, but a lot of people were still taking photos ...
My last look at the Musee D'Orsay website says that photography is not permitted. Pity as I will be going there in a couple of days. The reason given is the number of cameras being held at arms length blocking, (disturbing ?) the view of exhibits for other people. Sign of the times I guess. The last time I was in the Louvre, about 15 years ago, photography was permitted but no flash. Their site probably addresses photography.