When hay leaves a field on a wagon, some of the nutrients that helped grow it leave with it. If the hay feeds cattle on the same farm, some of those nutrients can return to the fields in manure. Where the hay goes makes a difference to where those nutrients may go next. Rudolf Steiner took up this relationship in his second agricultural lecture at Koberwitz in June 1924. He asked his listeners to think of the farm as an “individuality,” capable of supplying much of what it needed from within. He pictured land growing feed for animals and animals providing manure for the land. He acknowledged that a farm could only approach this ideal and described bringing in manure as a remedy for an ailing farm. That ideal raises a fair question. Can a farm really regenerate itself? No farm creates nutrients from nothing or runs like a perpetual motion machine. Sunlight supplies energy, while nutrients enter through sources such as rainfall, nitrogen fixation, weathering minerals, and materials brought onto the farm. Nutrients also leave in crops, animals, runoff, and other losses. Steiner explained his ideal through a spiritual worldview. We can also examine the movement of materials directly. When a farm feeds its own hay to cattle, some nutrients return in manure. When cattle eat purchased feed, some nutrients in that manure came from elsewhere. Manure can move nutrients around, but it does not make them appear from nowhere. What matters is what enters, what leaves, and where materials end up. I see a smaller version of this in my garden. I move some fallen leaves from the lawn to a bed where I want cover. Excess leaves go to a low spot to decay. I add chicken scratch, and the chickens mix the leaves through winter while leaving manure as they forage around the homestead. These practices move and recycle materials. These cycles still depend on sunlight for energy and on nutrients entering the garden from sources such as rain, soil minerals, and materials brought in from elsewhere. What materials do you move from one part of your garden or farm to another, and what changes where they end up?