There isn't much info available online about the "Poster Public Project," but the work is nice. It's a series of simple public posters featuring deep thoughts, whimsical observations, warnings, and encouragements.
Check out the entire gallery here. Oddly enough, it looks like some, if not all, of these posters were put up in countries where English isn't the first language, although it's really hard to tell from the photos. In fact, it almost looks like the images were deliberately framed to exclude any geographical giveaways.(Via Wooster)