In his work in short films, commercials and music videos, books and illustrations, and Fx has used a wide range of techniques, including 2D and 3D animation, stop frame animation as well as live action and special effects. And that's the case here.

Shot over five days in Romania - three of which in difficult, freezing conditions in the Carpathian Mountains - Fx makes great use of his widescreen canvas, then employs his animation experience to effect its heartwarming resolution.

Fx also designed Cassidy's costume, which was tailored by London fashion designer Cristina Aranda. And the intriguing bonnet was specially designed by Barbara Keel, a British artist who works with fine felt...