I know that there are some people who apparently operate with their eyes on the paper. They are more guided almost by the pattern.
To the person that deals in visualizations, I suppose there is something rather exciting about a whole set of people - they all going symmetrically, up or down, in a military sort of precision.
There are some people, by the way, that associate a certain amount of visualization with the performance of music. Those are people that really are not centrally concerned only with music, the traditional things.