Example image of eyePlorer eyePlorer map for 'Emotivism': Meta-ethics Proposition Sentence (linguistics) Expressivism Non-cognitivism Cognitivism (ethics) Ethical subjectivism Moral realism Quasi-realism Universal prescriptivism Alfred Jules Ayer Analytic philosophy Charles Stevenson Language, Truth, and Logic Logical positivism R. M. Hare George Berkeley David Hume An Enquiry Concerning the Principles of Morals Ethical naturalism George Edward Moore Naturalistic fallacy Principia Ethica Verificationism Vienna Circle Normative ethics Ethical intuitionism Truth value Body language Nonverbal communication Value system Scientific method Ethics and Language Public space Richard Brandt Utilitarianism Prima facie W. D. Ross Galileo Galilei Heliocentrism Zen and the Art of Motorcycle Maintenance Normative James Rachels Moral skepticism William Fontaine Moral relativism Wisdom of repugnance After Virtue Divine command theory Euthyphro dilemma