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I recall from quantum physics classes a long time ago that some elementary particles are not identical to themselves 360 degrees rotated. You need a 720 rotation for that. I recently learned that quaternions have that same property. Would there be a relation?

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yep, this exact thing is discussed in the later part of the video. it's used to hypothesize a qm interpretation where the complex components could actually be more physically interpretable as (quaternion-based) rotations of the kleinert crystal model

When was that then? I saw the spin animation, she did not refer to it then … although I was baking cookies at the same time so I might have missed a remark here or there.

vaguely a combination of 12:02-ish with 48:26-ish. my understanding was the general idea of the spin animation was proposed to be localized and manifest to some region of the kleinert crystal roughly corresponding to a given particle. so basically an internal torsion co-located with the phonon behavior that defines the paricle in that framework

Ok, will rewatch, thanks.

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