I took this photo on the streets of Copenhagen and after some internet research it turns out the piece is the work of Danish artist Marianne Jørgensen. It was created after she requested that knitters from all over the world send her knitted pink squares. She then filmed the process of stitching these squares together over the top of a WW1 tank as an artistic criticism of the Danes involvement in Iraq. It's very striking I'm sure you'll agree and it's certainly generated a lot of interest.
Thanks especailly to flickr user gillicious who picked up on the picture first and posted it to boing boing. The end result of this has been that it is to be printed in the Australian craft magazine Yarn! Link here