BTQURU 03 is a spectacular, 100 year old red oak: a tagged, tracked research specimen in a long term study of changing seasons at the Harvard Forest. Sprouted back when the industrial revolution was just getting started, the oak grew to tower over what was once a farmer's field, abandoned as people left for jobs in factories and cities – beginning the transformation of our world. Here, in this tree, is a living timeline of those social and historical changes, and their environmental consequences, observable in my tree's growth and even its breath.