Yarn bombing is part of a wider movement referred to as Guirilla art, people taking upon themselves to add visual improvements to their neighbourhoods.
Gardening, planting wild flowers, trees, vegetables for the benefit of locals and the environment.
Graffiti – not mindless tags but beautiful artworks often with a political or social message.
Yarn bombing – lots of images on Pinterest of imaginative and amusing installations. Site specific, sometimes event specific. Individual or community installations
Ann Eunson for example has knitted a lace pattern fence around her garden using a traditional Shetland design. This I love for its delicacy and tenacity. Art in unusual places always sparks a though stream, maybe because it takes you unawares during a time of contemplation.
Outsider art as opposed to incredible installations by Sheila Hicks or Toshiko Horiuchi MacAdam http://www.knitjapan.co.uk/features/c_zone/horiuchi/profile.htm?utm_medium=website&utm_source=archdaily.com Thttps://www.archdaily.com/297941/meet-the-artist-behind-those-amazing-hand-knitted-playgrounds
In the fine art world