Having a degree in mathematics doesn't mean I can count.
I dug out all my squares yesterday to show off to some of the knitters in my life, and it turns out that I've actually got 20 done.
This, it seems, is actually number 21.
And now I have four balls of yarn left and only three squares left to knit.
This is awful for two reasons. Really, how on earth am I to choose which colourway to abandon? And this means that I'm closer to the end than I feared.
I will miss this pattern.