Danita Maria I also like these. When I was in college I strapped led lights to different parts of my body and danced. I shot them on slide film (remember that?) and showed them projected. These remind me of that.
Barry Allan Scott I once had a conversation with a docent at the National Gallery in Edinburgh about this. She said it was partly to do with the copyright of images. In other words, protecting the art from being photographed meant the museum could sell images of them in the shop, but also to historians and artists writing books about them. She also said that the copyright was a vague issue for some of the paintings, they can be old enough to be exempt from copyright, but could be on long-term loan from someone who has a copyright arrangement on it. So it's safer for the museums to ban photography of the exhibits.
kendall haha! i've always just assumed it was a lie to get people not to do something that a) like barry said, complicates their copyright issues; and b) is actually just annoying and disruptive. those are less effective reasons than 'you're damaging something'.