The first animals to ride in a hot air balloon were a rooster, a duck and a sheep.
I enjoy the symbolism of the hot air balloon. It's a symbol of escape and voyage, but in particular an escape into fantasy and the surreal, of the mind into daydream and the subconscious.
The movement of the balloon across the body is an exploration of the link between the physical body and the psyche. The placement on the foot worked well with that idea, as our feet are representative of our own personal journey.
Images: Rawinsonde weather balloon, Jules Verne, Odilon Redon, my own print and animation.