I first noticed designs “grown” on apple peel in the produce section of our Polish supermarket. It seems like a clingy sticker (or maybe a wax stamp) is placed on the side of the apple getting the most sun, the side that will get the reddest. The lack of sunlight, keeps the area under the sticker green. I wonder if children are more likely to want smiley apples. Are they popping up in your markets too?