Exactly 25 years ago on a warm autumn afternoon a young ecologist walked slowly through a tiny oak wood, and perched on a log to reflect. He had measured and seemingly knew "all" the species present - trees, mosses, mushrooms, birds and more. The research, based on this and other woods in the landscape, was the first rigorous test to see if island biogeographic theory was of use in heterogeneous land. Unexpectedly, an interior-to-edge model was found...