Watch VoirFilms. Living in an ancient redwood tree for more than two years to prevent the tree from being clear-cut, Julia Butterfly Hill captured our hearts and minds by showing us that one person can make a difference. Through interviews with Hill, filmmaker Doug Wolens paints a portrait of an intensely spiritual and articulate woman who encountered both beauty and horror (she was assaulted by lumber company helicopters at one point) during her time above ground.