A person exists by differentiating self from other
And by connecting self & other.
These are the two functions of a boundary.
The boundary between self & environment must be permeable to allow for exchanges,
yet firm enough to enable autonomous action.
Firm, because it gives a sense of identity.
When the boundary becomes unclear,
It leads to identity confusion,
mental & emotional disturbances.
(WP-Congratulations on writing 200 posts on whisperer2!)