Graffiti has long since been a controversial issue. Is it art or a nuisance? You might have to reconsider your thoughts on the subject after reading Yarn Bombing by Mandy Moore and Leanne Prain. Yarn bombing is crochet and knit graffiti. Put simply, it is a guerilla crafting movement that seeks to create yarn art installments, like tree sweaters, street pole cozies and knitted flowers, in urban and natural environments. In Yarn Bombing, you’ll find interviews with originators, patterns and how-to tips that will help you join this covert, D.I.Y. trend.