What is Graphic Design?

I was casting around for poster ideas when I came across this site:

http://veerle.duoh.com/blog/comments/winners_of_the_what_is_graphic_design_poster_competition/

The winning entries were quite amazing. You can look at the site for the posters themselves, but here below is one of my particular favorites.

All posters have to answer the question posed above, btw (what is graphic design?). First to figure out what this one says wins a cookie.