I say yes it is something, although trespass might be the wrong label for it. Reason: you purchase or build a wall to enjoy it's features. Those might be prot

I say yes it is something, although trespass might be the wrong label for it. Reason: you purchase or build a wall to enjoy it's features. Those might be protecting your property, keeping out cold, or having a certain appearance. If I have a yellow wall and you project red onto it, then you have denied me a feature of my wall. Hence, you should be stopped from doing that. A second concern, who is responsible for what is projected onto the wall? The owner of the wall or the projectionist? Say someone projects some questionable video on the wall. If the wall didn't exist the video would not be showing to cause the concern to passing people. But it does, so who gets the fine?