What it is the internal space?

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TL;DR
Spin in Physical Space, Internal Space, and Hilbert Space:

What it is the internal space?
Spin in Physical Space, Internal Space, and Hilbert Space:

Spin is already a great unifying principle in theoretical physics, but its potential is far from exhausted. Here I discuss – very concisely – the role of spin in particle physics, in space-time physics, and in ideas for unified field theories. I then discuss spin as an emergent property, as it arises in connection with abelian and nonabelian anyons.

What it is the internal space?

http://www.bourbaphy.fr/wilczek.pdf
<< Mentor Note -- the Mentors have discussed this thread start, and believe that given the reference, the OP @seletynof's question is valid. Thanks >>
 
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Three overlapping circles on black: Semantics (blue), Ontology (red) and Epistemology (green), with PHYSICS in the central overlap; each circle has a short statement and 'Methodology' is written at lower right.