I think when unicorns move they should almost seem as if they're underwater. Deer are clumsy. Gazelle are too abrupt in their movements. But there are certain kinds of horses that seem to float and flow when they move, no matter what speed they're going. I think that's what people had in mind, and the way deer are suddenly there and then suddenly gone, melting and vanishing and you know you'll never catch them. As for the goaty influence~~Goats are cool! I used to have them. They have presence despite themselves. There's nothing so unflappable and undeniable as the dignity of a pygmy goat standing on a dogloo.