There are lizards or beetles that tumble down sand dunes.
Maybe cartwheeling humans could lead to some adaptation where the whole body becomes the wheel.
There are lizards or beetles that tumble down sand dunes.
Maybe cartwheeling humans could lead to some adaptation where the whole body becomes the wheel.
Wheels are not balls. Balls are common in nature. Wheels are not. The difference is that wheels need roads, which are not common nature and a large scale artificial objects.
That makes sense. Even in the Pullman book there were natural roadways for rolling.