I defend metaphysical coherentism, according to which reality is an interdependent network, system, or web, held together by a relation philosophers call metaphysical explanation or grounding . If coherentism is true, nothing is ungrounded, things ground each other, and understanding what it is to be any given thing – a tree, a house, or a person – is grasping how it fits in: how it grounds and is grounded by its environment. Coherentism is inconsistent with a widely-accepted, orthodox view of grounding, according to which certain fundamental facts about reality asymmetrically determine everything else. In Chapter 1, I argue that this view is not supported by any compelling argument,but merely assumed. In Chapter 2, I argue that explanat...