
In academics, we can see that some disciplines primarily study the left-hand side of reality, and others primarily study the right-hand side.

Some disciplines, such as psychoneuroimmunology, study the relationship between the two sides.
There is a correlation between the level of interior consciousness of an organism on the left-hand side, and the physical structure that houses it on the right-hand side. For example, in the progressive evolution from reptiles to mammals, each new level of organism that emerges has both a higher interior level of consciousness on the left-hand side, and a more complex brain structure on the right-hand side.
To purchase the book this diagram is from (The Integral Vision), click here.
2. The second fundamental distinction is between the individual and the collective.
When we combine these two fundamental distinctions (interior/exterior and individual/collective) we get the four quadrants:

These four aspects of reality are inter-dependent. Each exists in connection with the others. When something happens, it happens simultaneously in all four quadrants. For example, let's consider the experience of having a toothache.
Integral theory asserts that all of these views are mistaken, and that each of the four quadrants represents a fundamental aspect of reality, which co-exists with and is not reducible to any of the other three.
Perspectives
The four quadrants can also be viewed as four perspectives. The upper left quadrant represents the 1st person perspective ("I," or the person speaking). The lower left quadrant represents the 2nd person perspective ("You," or the person being spoken to), and the 1st person plural perspective ("We," or the mutual understanding between "You" and "I"). And the two right-hand quadrants represent the 3rd person perspective ("It" and "Its" in its strongest form, or the person or thing being spoken about).
These three perspectives turn out to be similar to other broad categorizes of human knowledge and experience. For example, Plato's the good, the true, and the beautiful. Or art, morals, and science.

Click here to hear Ken Wilber talking about quadrants and perspectives. To purchase the CD sets that are the source of the clips on this website (Kosmic Consciousness and The One Two Three of God) click here.
God or Spirit in 1st, 2nd, and 3rd Person
These three perspectives can also be seen in the worlds' great religious traditions, as perspectives we can take on God or Spirit. Judaism, Christianity, and Islam understand and experience God primarily in 2nd person, as a great "Thou" or other. Buddhism understands and experiences the Divine as the great "I," or my True Self. And Pantheistic traditions experience God or Spirit as Nature or the great "Web of Life." In the integral model this doesn't mean that there are three different "Gods." It means there are three different understandings and experiences we can have of the One God or Spirit.
In the integral model, no one of these views of God or Spirit is seen as the only "right" one. Each perspective has something important to teach us. Without all three, our understanding and experience of the Divine is incomplete.
Click here to hear Ken Wilber talking about God or Spirit in 1st, 2nd, and 3rd person perspectives. To purchase the CD sets that are the source of the clips on this website (Kosmic Consciousness and The One Two Three of God) click here.
To purchase the book this picture is from (The Integral Vision), click here.