Yarn storming: the art of enhancing a public place or object with graffiti knitting or crochet (and running away giggling).
I love BMD's graffiti (see 31 August, & 10, 11, 12 October) and was photographing the wall in the background when I spotted the knitting woven into the fence and realised I had stumbled upon knitting graffiti, or 'barnstorming'.
