Iago’s ‘I am not what I am’ epitomises how Shakespeare’s work is rich in philosophy, from issues of deception and moral deviance to those concerning the complex nature of the self, the notions of being and identity, and the possibility or impossibility of self-knowledge and knowledge of others. Shakespeare’s plays and poems address subjects including ethics, epistemology, metaphysics, philosophy of mind, and social and political philosophy. They also raise major philosophical questions about the nature of theatre, literature, tragedy, representation and fiction.