I have this theory. It involves the complex topography of knotted string and nieces.
Do you remember making friendship bracelets? (I must admit that I still do this.) I'm thinking two of my little nieces have hit the magic age where this would be a great activity for them. So I've gotten the big packs of assorted perle cottons and an instruction book for each as Christmas gifts. I've also made each of them a bracelet to wear, plus one for a younger sister so she won't feel left out. The wide one is special free-form one - not sure who's stocking it will end up in.