This is what I spent most of last night doing. I thought up the idea around midnight, and spent the next three hours with Pythagoras, a calculator, and my evolving plans. I think I've got the pattern done, so now I'm going to try and sew my first one. It will be Josie's First Birthday present. And then I'll make one for Ben, too. I am so so sooo excited, and I really hope the numbers work!