The Blue Trees is a Vancouver Biennale initiative launched during the 2009 – 2011 exhibition that has gone on to become an international award-winning public-art installation created in over 14 cities across the world. This art installation brings environmental consciousness and social action together through community participation. Pigmenting trees blue, a colour not naturally associated with trees, temporarily transforms a familiar urban landscape. Trees are largely invisible in our daily lives, and the blue colour is a means of altering perception, a powerful stimulant used to raise social consciousness about the role of trees as the lungs of the world.