Steve asked, what is the most efficient animal in motion?
People would give many answers.
The correct answer was a condor in flight.
A common wrong answer was a human being.
Steve then pointed out that the human isn't even close. Not even in the running as far as efficiency of some other animals.
But . . . if you give the human a bicycle, then the human absolutely cleans up in terms of efficiency. Steve wanted personal computers to be "a bicycle for the mind".