Moving sculpture
I have found Rudolf Steiner talks about eurythmy in comparison to the sculptures too....

" What has to develop out of eurythmy is a newly creating, moving sculpture. And for this living sculpture we must of course make use of the human being himself –– here one cannot use clay or marble. . . . . . Sculpture portrays what is dead in the human being, or at least that which is death-like in its rigidity. Eurythmy portrays all that in the human being which is of the life laid hold of man and placed him into earthly evolution, giving him his earthly task. There is perhaps no other art through which one can experience man's relationship to the cosmos so vividly as one is able to do through the art of eurythmy. Consequently this art of eurythmy, based on the etheric forces in man, had to appear just at that time when modern spiritual science was being sought. For it was out of this modern spiritual science that eurythmy had to be born."
From " How Does Eurythmy Stand With Regard To The Artistic Development Of The Present Day?"
Introductory words by Rudolf Steiner to the eurythmy performance 26th December 1923, Dornach.