I was recently in Crystal City, a section of Arlington, Virginia. While walking to the metro station, I noticed something new to me.

It’s a sidewalk message. Not exactly an advertisement, but more like a public service announcement.
To me, that seems like a good way to communicate a specific message exactly where it can reach the intended audience. Of course, such a practice could easily be overdone. You would have to limit it to a specific type of purpose (PSAs in this case, for instance), and you would have to regulate the number of them and how they are produced.
With that in mind, I could see them being an effective tool, especially around downtown.
So what message would YOU put here?
