 Second, philosophy of mind. Although there has been limited systematic discussion of metaphysical explanation in the area, considerations about metaphysical explanation inform some of the most fundamental questions in the discipline, such as how it could be the case that consciousness exists. It is fairly common for the grounding literature to mention by way of elucidation of the notion of grounding that we might think of mental facts as grounded in the physical facts. This example is supposed to be compelling because of the attractiveness of the idea that physical facts determine and metaphysically explain the mental facts, and grounding is a prima facie appealing notion with which to characterize the relationship between the mental and the physical precisely because of its explanatory nature. This idea is made more precise in the development of grounding physicalism (see, e.g., Ney 2016; O’Conaill 2018; Rabin forthcoming-a, forthcoming-b; Schaffer 2021), though this new version of physicalism has not been met with universal approval (see, e.g., Melnyk 2016; J. Wilson 2018).