They work with the stealth and secrecy of well-trained warriors.
But the results of the efforts of the Graffiti Grannies are guaranteed to bring a smile to the faces of Truro commuters.
The craftswomen indulge in the modern practice of yarn-bombing - adorning public places with intricate woolenwear.
Now the secretive group has targeted the park-and-ride in Truro for the second year running.
Anybody with any wool to donate to the renegade knitters is asked to leave a message on the group's Facebook page.
