prototype

In addition to the logo, Prophet helped design a modern restaurant prototype that the chain rolled out in four Cracker Barrel stores.

The trio once had big plans centered on the prototype of an artificial heart they designed, THUMPR7, which they were convinced would change the world by extending the lives of millions, rich, poor or otherwise.

Not your average ergonomics paper - and just the kind of delightfully oddball idea: a prototype for a UVC light-equipped shoe rack that doesn't just store shoes but sterilises them.

But the company only rolled out 20 or 30 prototype taxis this year, in Austin, Texas, with human drivers behind the wheel.

At an unveiling event for a prototype of the self-driving Tesla Cybercab last year, Musk expressed lofty ambitions for the future.