MODERN DANCE Dance seems to have ceased to be a vertical expression of a horizon

MODERN DANCE

Dance seems to have ceased to be a vertical expression of a horizontal idea, a means of social bonding, and the expression of grace as the signal of our conversion from base animal to the aspiration of angels, into a sophisticated gymnastic sport set to music as a test of biomechanics limits.

What does that mean? What is that change saying in an unindented essay about us? I am not sure I understand.