What is an adaptation? What is a niche? The category-based nested form turns out to be useful in relating the two. An adaptation exploits a niche. A niche is the potential of an actuality independent of the adapting species. What is the human niche? What is the potential, independent of the hominins, that sculpts our ancestors through many generations? These questions are addressed in the masterwork, The Human Niche, which stands upon four pillars, comments on recent books on human evolution.