This is an image of a GNU meditating and playing the flute, surrounded by Chinese writing which says "Wu Wei", or in English (a rough translation) "Not forcing". There is also the Yin Yang symbol behind.
Just because I know some will think this is the cliched westener putting symbol he knows nothing about there to look cool (which does annoy me lol), I'll explain a little about them.
Wu Wei is part of the philosophy of Taoism, and this particular aspect talks of how we should not resist what is natural. By accepting the tension between opposing forces, by not getting in ones' own way, one can live more easily and pleasantly. By the same token, I believe a desktop should not force itself upon the user, it should become almost invisible, so that it enhances your experience of the tasks you are doing. That is my "desktop philosophy" (hmm!) which I like to translate to my background.
The GNU is turning the use of his computer into a personally enriching and poetic affair by meditating with his flute. He does not need to even touch his keyboard, so at one with his computer is he, without losing himself to it.
Oh and I should point out that I stole the GNU itself from http://www.gnu.org/graphics/meditate.html