Natural sense of rhythm?

[Mation]

on this point, I have occasionally wondered about the odd side to side swing thing that Ray Charles, Stevie Wonder and a few other blind piano players do.
they're both considered musical geniuses (let's leave whether you agree to one side for now) but that dance looks kind of odd to us.
clearly they've never seen each other do it and there is no visual element to what they're doing from their point of view.
But surely they are in time with what they're playing and hitting the beat?
although it doesn't appear that way particularly.
Does that suggest that there's a very strong visual element to the idea of dancing on the beat? that it's not just the rhythm?

That seems to me to be moving to the sentiment, often corresponding with the vocals but switching between that and the emphasis of a stirring chord sequence or whichever bit of the arrangement is the most emotionally salient at the second. May be a nonsense theory, but it's sort of what I do (chair dancing) to stuff that isn't particularly rhythmic. I know they do it to music that is, but perhaps if you're not trying to find a rhythm (even if you are perfectly capable of doing so) because you're not both seeing and hearing it, then moving with the goosebumps is the most natural thing to do.

Alternatively, no idea!