Change the shape of the drum and you change the tyre that emerges.

ECONOMIST: Re-inventing the wheel

Raw rubber is heated and extruded on to the drum, followed by successive layers of steel wires and strips as the tyre takes shape.

ECONOMIST: Re-inventing the wheel

Being pushed out of shape made me realize that I had a shape to return to, like my toy cat who sat on a drum and whose parts were kept in tension by elastic.

NPR: Excerpt: 'The Importance of Music to Girls'