Most of his mesmerizing sculptures are made with just cardboard, glue, and a knife. Warren shows us how to build our very own robot helmet, using the techniques he's perfected throughout his career.

Brilliant Corrugated Cardboard Kranium Helmet is 4 Times Stronger Than Polystyrene Reduce, Reuse, Recycle Environment Reduce, Reuse, Recycle 06/13/2011 under Reduce, Reuse, Recycle, Transportation ...

He claims that his cardboard helmet can absorb three times the energy of many polystyrene-based helmets. As the Urban Velo website reports, the Abus helmet "is slated to be released in the States ...