Nokia Conversations, Nokia's official blog, has published a "short film that tells the design collaboration story behind Nokia's first Windows Phone". The video talks about the choice of materials and how the design aims to make the Windows Phone UI as intuitive as possible. There's also glimpses of early wax prototypes, early versions of the polycarbonate shell and concept sketches.

Here's what Nokia Conversations says:

The Nokia Lumia 800 builds on Nokia’s “fabula” design language, a visual style that has been created to be used across a range of products, including the Nokia N9. But in creating Nokia’s first Windows Phone there was a whole lot more to the process than simply blending together Nokia hardware and Microsoft software.

Nokia Lumia 800: in-depth 8 minute video dcoumentary

Description:

We go behind the scenes at Nokia's London design studio with Stefan Pannenbecker, VP of Industrial Design at Nokia, Chris Linnett, Head of Lumia UX design and Kate Freebairn, Creative Director for Lumia UX design to explore the story behind the creation of Nokia's first Windows Phone.