Brianna was just doing this worksheet where she had to color all the odd numbered spaces one color and all the even numbered spaces a different color. It actually made a cool, but subtle design. When she showed it to me, I said, "Well, there are two problems, but I think if you look at it closely, you'll see that there's a pattern and you'll be able to spot the problems easily." She said, "Hmm. I don't see a pattern. Oh! You mean there's symmetry! Okay--I got it." I think symmetry is one of her very favorite concepts. It's cool that symmetry melds together logic and art.