The Hoffman Process is wonderful and liberating, because it gives a whole week of catharsis after catharsis, and tools to access the subconscious and its wisdom.
The image is a symbol of the human being as “quadrinity”. The circle is the body, encompassing the whole. The large rhombus is the spiritual self, and the other rhombuses the emotional being and the intellect, all interlocking. The process gave me another view of different aspects of the person in dialogue, sometimes in dispute, and so validated that perception in me.
My disagreement with the Hoffman process is that it demonises the “dark side” as an enemy, where I see it as an “inner critic” which may be made a friend. However they are certainly right that the inner critic must be dethroned from dominance before it may be a useful member of the committee of the self.
And, since doing the Process, I have spent a number of evenings in the houses of other spiritual seekers, sharing our growth and process. It is a powerful tool in shedding habitual, inherited patterns of behaviour, and gaining choices over how to be in the World.
There is a lot on personal growth stuff here. If you are interested in Hoffman, you may also be interested in the Human Awareness Institute.