 Again, the question perhaps most central to a general theory of law, namely whether law can have a nature, and if so whether it is to be understood on the model of artefacts, or alternatively by study of concepts (“conceptual analysis”), seems to tackled with most explicitness and attention to different and related kinds of subject-matter by theorists working in the philosophical tradition that is or concerns the topic of this entry: Murphy 2015; Finnis 2020. 