The first time I saw this, it took me about 15-20 very frustrating minutes to figure it out. On the site where I first encountered the "Petals around the Rose" puzzle, the author noted that the longer it takes you to figure out, the smarter you are. I don't remember the URL, but according to him, 6-12th grade students consistently "got" it in 5-10 minutes, whereas most established scientists wrangled with this for days, some never getting it at all. It's just the way a brain tackles (in this case) a very simple problem. Smarter people tend to overthink the puzzle. As such, for the folks who got the puzzle on the third or fourth rolls.... umm... I hear the short bus is waiting for you
