.... had obviously never painted them.
Persiennes are the things known in English as louvre doors (why???). I like them. But painting them is truly chiant. Oh yes.
I'm one third of the way through painting and patining seven of them, front and back. Each door has 66 slats. Each door needs three coats: one base, one wash coat and one patina coat. That's 2772 slats, if you count both sides. Each one is at a silly angle so that if you're not hyper-vigilant all the paint runs down and pools venomously on the other side, forcing you to leap like an ant-bitten maniac from one side to the other every twenty seconds.
It's - how can I put this? - interesting ...........