It is clear that as an end in itself, the aim of [the piaffe] has been missed when practiced merely for the beauty of the dance-like steps. It is not pleasant to observe the absence of harmony between the stiff and troubled rider who exerts himself in the saddle in order to achieve the successful outcome of a trick and the increasingly lethargic protest of the horse. … Whoever has an eye and sense for natural movement and harmony will feel hurt over the injustice – the beauty of nature’s creations make the human being also responsible for the development of art.
Egon von Neindorff, The Art of Classical Horsemanship
Horse Crazy Once Again 