Ha! I looked at that and looked at that this morning. I swear it looked like each side was quilted specifically for that pattern. Eventually, though I saw that the quilting is done to enhance the "top" top - the one with the deer and hearts on it. There was a shot where I could see that there are quilted hearts showing on the bottom of the star that is on the right of the "back" top.
Pretty amazing, isn't it?
I have done two - sided, but they did not have any custom quilting, just an overall panto (I quilt by check),so it was not nearly as clever looking.