Here is the belly button from the wrong side. This picture makes it much easier to understand the written explanation (maybe?). The thick white cotton is Bernat Crafter's Cotton, and that'll be cut off when I finish the centre. The fine white thread is Size 20, and obviously the strand of blue wool is my project thread. It's very fine 2-strand pure wool, and a real pleasure to knit with. The only problem is that the light source needs to be very strong, as knitting with a dark thread strains these old eyes much more than with the fine white thread.