What amazing equine art! The show is called "War Horse" and is based on a book of the same name by Michael Morpurgo which tells the story of WWI through a horse's eyes, a horse who was raised on a private farm, got recruited for the British Cavalry and then was captured by the Germans. The way they created these horses for the stage is really incredible; I can't believe all the coordination involved and how realistic they look when it all comes together. Maybe if the show does well enough in London we'll be lucky enough to see it come to the US. Here's another video that shows a little more behind the scenes: War Horse.