The logical structures which underline our thoughts and actions develop out of a pre-existing system of communication and relationships. They are expressed in the sign and rule systems which correspond to this communication system, and they are codified in our language (cf., Whorf and Lacan). Simon argues that all logic develops out of the dialectic of the pleasure and reality principles. This includes the logic of psychotic thought, the structure of which he seeks to reveal by reconstructing the preverbal structures of logic in the neonate.