Crocheting in the subways of Hamburg

I have crocheted this bangle while riding the subways of Hamburg
in the period from 8 November till 20 December.
I crocheted only while riding in the subway, in the color of the current subway line.

I started at home, because the beginning is complex
(you have to sew, which would be difficult in the subway).
Every time I went on subway, I crocheted.
I don't use it often (as you can see in the graphic), that's why I took so long to complete the bangle.

See the whole picture here:
http://www.flickr.com/photos/madame_ulani/8342689894