Very cool knob. I would love to interact with this type of feedback (where it makes sense).
Funnily enough I recall using something less cool looking in a BMW 5 series from almost 20 years ago. The knob would stop rotating at the end of menu lists on screen when you could scroll no further.
It made sense, but I recall it being so novel that I spent more time trying to make it NOT move than actually just using the menu system.