The transparency of the sculpture accommodates the fence, welcoming it into its structure. Instead of becoming a distraction, the fence is an integral part of the art, a symbolic limitation on the horse's freedom. Yet the horse still dreams of freedom -- hence the cloud coming out of his head. A wonderful image, Tim.
I have not seen this before...it's like a wireframe for a sculpture!, but I imagine that this IS the sculpture as-is. Nice job silhouetting it against the sky.