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You must have a decent grasp on this all by now.
Some doors are doors, some objects are doors, some doors are objects, the only question is the object of it all.
The object is downright within reach if you focus.
A stream carves its own path, from river to trickle its nature does not change, only the vigor with which it carves and the time scale in which it acts. The rain sustains it but exists in a separate context.