Knitting a Tube, on the Tube

I have been working on my Here and There Hat (scroll down), in a manner suggested by its name: this is a hat that seems to ask to be knit in little captured bits of time, here and there. Stacking rows of spongy gold upon vinous purple, pulling udon-like strands of Malabrigo from the centre of my squidgy yarn-cakes: it's a pleasant business. 

Since arriving in the capital, I have largely eschewed the tube. I prefer to use my two wheels and two quadriceps, and zip about on the face of the city, rather than tunnelling around under its skin. This means that every time I do take the tube, it feels like a bit of a treat, especially when my tubular hat-to-be coordinates so beautifully with the yellow poles of the Northern Line. 

Now if I can just perfect the art of knitting while cycling...