"My ethical sympathies lie with open individualism; but as it stands, I don’t see how a monopsychist theory of identity can be true. Open or closed individualism might (tenuously) be defensible if we were electrons (cf. One-electron universe - Wikipedia). However, sentient beings are qualitatively and numerically different. For example, the half-life of a typical protein in the brain is an estimated 12–14 days. Identity over time is a genetically adaptive fiction for the fleetingly unified subjects of experience generated by the CNS of animals evolved under pressure of natural selection (cf. Was Parfit correct we're not the same person that we were when we were born?). Even memory is a mode of present experience. Both open and closed individualism are false."