This is a bit off-topic, but I’ve always sort of admired these signs that appear in the subway stations of New York City:
I think it’s the simplicity, the font, and the size of the sign. At first glance, it almost looks like a minimalist ad campaign. Whether or not these notices are meant to be stylish, I don’t know, but something attracts me to them.
I’ve noticed recently that they’re being replaced with a less awesome design, which is disappointing. So before they’re all gone, I took a picture of one at the Broadway-Lafayette station.