I've been around horses, more or less, since I was a kid. Though I don't own one and don't consider myself a "horse person", one of my sons and one of my daughters have owned horses for quite a few years now. My son is also a full time farrier. All this makes this story all the more interesting to me.
That story reminds me of the excellent video produced by Kent Masterson's Brown's company. You can watch a few minutes of it below. It is a fascinating film. I'm currently working on a review of Kent's latest project, The Southern Cross, which Kent was kind enough to send me a copy of.