E Pluribus Unum:
The Unified Diagram of Being, Experience, and Knowledge

This diagram sums up many different views about the relation between knowledge, experience and reality (or between thought, experience and things or between epistemology, phenomenology and ontology).

the outer circle represents reality, all reality, whether we can access it or not

the triangle represents the three ways in which reality may be approached by human beings:

☞ ο stands for (to onta and it refers to reality as is (what there is)

☞ φ stands for phenomenon and it refers to reality as appears (what we have an experience of)

☞ ε stands for episteme and it refers to reality as is known (what we know)

the inner circle singles out a simplified version of reality, a version popular as of Galileo and Descartes. It envisage the split of reality between a a mental and a physical domain. It is smaller than the triangle being a subset. It is divided sharply in two halves (the black and the white) to express the (wrong) assumption that reality is divided in two unmixable halves

PS. To my chagrin, a wrong version of this diagram has circulated in a few of my works (before 2008). In such a version, the π letter wrongly subtitutes the φ letter.