As Ellen was running away from Espinoza she programmed her clothes to look like the brick wall that was behind her. Espinoza was able to see her because her hair was a different color then the brick wall.
"Yarn bombing" is a relatively new form of hypermediacy. Not only is this a form of abstract art, the bright colors draw attention to the shape of the tree trunk and display. This site has an awesome Collection of street art pieces