This concept of definable and distinguishable boundaries is also true of ideas.

So long as an idea exists in your own mind exclusively, it is your property.  Once that idea is shared with others, unless an agreed-upon boundary is first established (copyright, patent, etc), the idea is no longer bounded by your own mind.

However deplorable this may seem to inventive and creative people, it is a fact.

An idea for which the boundary has vanished is no longer a property.  It thus cannot be owned.

The trouble most "idea" people experience is that they want to share their ideas with others, but at the same time they want to remain in exclusive possession  of them.  This isn't possible. 

Ownership by definition is an exclusive condition.  It is predicated upon a discernible and defined boundary.  Take away or fail to clearly identify the boundary, and ownership will in fact vanish - if indeed it ever properly existed in the first place.