 As an intuitive (though perhaps not realistic) example, he notes that people undergo significant temporary psychological change when they are caught up in the interactions constituting a mob. His central realistic example comes from the Standard Model of particle physics, which describes partless muons as very quickly “decaying” into electrons, electron neutrinos, and muon neutrinos (2016: 66–67). Here there is fundamental change apart from any triggering interactions, and not merely a change within individuals but change of individuals from one kind to others. Humphreys further notes that his earlier “fusion” account of emergence (1997) is a special case of transformation. When fusion occurs, basal entities or certain of their properties are lost when they fuse with others in producing a unified whole (2016: 74–5). (For accounts similar to Humphrey’s, see Guay &amp; Sartenaer 2016 and Sartenaer 2018.)