View Photo Gallery: Yarn-bombing is like grandmotherly graffitti. Instead of tagging a building with spray paint, yarn bombers leave their mark with knitted objects.

(Courtesy of The Phillips Collection)

Looped Yarn Works created dozens of hearts to decorate the area, and they’ll be on display throughout the week. (They’re collecting your photos on Flickr.)

View a few photos from besotted commuters here: