Throughout history, logic has been identified with *how the mind works*. The central concepts of logic (AND, OR, NOT, IMPLIES, EQUAL) are in our language and have been for thousands of years. Formal logic itself has changed and evolved over this time period, beginning wit Aristotle’s Square of Opposition, and grown though syllogistic logic, diagrammatic logic, Boolean logic, and natural deduction. Applying iconic techniques to elementary logic drastically changes logic into a form that is almost unrecognizable. Yet the results of boundary logic techniques are the same as those of conventional logic. It is possible, indeed rigorous, to say that logic is a particular way that the body works, that ** deduction is visceral**. The

*shows Frege’s diagrammatic notation for logic, in particular the representation of*

**Image**

This page is under construction, 2018