Some pictures shouldn’t have been taken. This one for example.
I was 10 when I first heard a tourist guide saying it: Pictures forbidden. It was in Egypt on a dam close to Assuan. The guide said it was a “strategic place”.
Anyway, I guess rules are there to be broken. I don’t have any understanding for the picture ban in some museums.
We are free to take pictures of things, aren’t we? Of course those who work for someone or something seemingly important like the Museo del Prado, won’t want to have you taking pictures. That’s their business. As a visitor my goal is to capture the moment, keep traces of what I experienced.