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.

Then cut out those diamond shapes, gently squeezing the tubes and snipping across the fold. Note: The finger joints are diamond-shaped holes cut into the cardboard tubes.

HandiMate, developed by researchers from Purdue and Indiana universities, lets children (or anyone else) build robots with cardboard, velcro, and other cheap, easily available materials.