Annie-B: rhythm among the elements

Well I actually wasn’t thinking about the comfort zone. I was asking why rhythm would necessarily be a more interesting element than any other element that dance is composed of. Rhythm, or any other element or combination of elements, is only as good as its choreographer, inside or outside the comfort zone.
I would disagree with you also, Paul, when you say rhythm sets us apart from animals. It seems to me that rhythm connects us to animals, rather than sets us apart. Observe animals moving together in a group.
And for me, unison and rhthym are related but not the same thing.