Self Expression or Vandalism

I have a new wall. It is white and I admit, inviting. The suggestion has been made by several friends to do a mural on my front wall.
How very odd today, to go out and find that someone "tagged" my wall.
We each have a need to be seen. To be heard...valued...significant somehow, in our own tiny circle of the world. How very strange to have my personal space, marked by a total stranger...