I don’t know if this has already been passed around here, but a guy I work with sent this on to me this morning. If you already know it, or figure it out right away, don’t spoil it just yet. Let’s see how everyone does
http://personal.baker.edu/web2/cdavis09/roses.html
and for a little more background on it:
http://member.melbpc.org.au/~lborrett/computing/petals-bg.htm