In an alternate past--or possible future--a mighty tree stands on the banks of a winding river, bearing silent witness to the flow of time and change. A family farms the fertile valley. Soon, a village sprouts, and not long after, a town. Residents learn to harness the water, the wind, and the animals in order to survive and thrive. The growing population becomes ever more industrious and clever, bending nature itself to their will and their ambition: redirecting rivers, harvesting lumber, reshaping the land, even extending daylight itself...