No Parking Notices Grow On Trees

Have you noticed how many notices there are around us telling us what not to do? Have you ever wondered where they all come from?

I may have found the answer today. While searching for a parking place I noticed this 'no parking' notice tree.

Maybe there are other species - such as the 'keep off the grass' notice tree or the 'no ball games' notice tree.

I don't like notices that tell me what not to do. It makes me want to do that thing, whatever it is.