The skull is not the boundary. It never was — it is just the place where the boundary has been conveniently easy to find.
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The skull is not the boundary.
It is a very useful landmark. Most of the nervous tissue that supports human consciousness is inside it. Most of the sensory and motor wiring passes through it. In ordinary cases, if you want to find the machinery of a human mind, the head is an excellent place to look.
But convenience is not definition.
Movement II already established the definition. A boundary is a maintained interface. It is not skin, bone, membrane, or wall. It is the functional relation through which inside and outside are coupled while remaining distinct enough for one side to have a perspective.
If that is right, then the skull cannot be the final answer. It is where much of the current machinery sits. It is not what makes the machinery yours.
The boundary is not where the tissue is.
The boundary is where the self-maintaining relation is.
Uploading stories often sound like a mind has to cross a wall.
There is the mind inside the skull, and there is a machine outside the skull. The problem is imagined as moving the mind from one container to another. That picture makes the transfer look almost supernatural. How could the inner thing leap out? How could the outer thing become you?
But the container picture was already wrong.
There is no sealed inner object waiting to be moved. There is a boundary-maintaining process supported by tissue, body, world, tools, habits, language, and other people. If a new substrate becomes functionally integrated into that process, then it is not “outside” in the relevant sense merely because it sits outside the bone.
A synthetic neuron inside the skull and a synthetic neuron outside the skull differ spatially.
They do not necessarily differ functionally.
The discriminator is not location. It’s participation in the boundary-maintenance loop.