No such thing as a straight line

There is no such thing as a straight line in nature. Think of one.

  I can't. 

Funnily, i believe a large percentage of injuries and arthritic conditions can be avoided by simply living with a direct 'feet-on' connection to nature rather than trying to pave her entirety so we might exist on multiple flat planes....with flat feet...
supported by, yet removed from mother nature forever by the 1/2" of rubber underneath us....

In the personal training world we teach instability as a means of gaining stability, uneven surfaces to stimulate kinesthetic awareness and through the nerves and musculature and therefore arches of the feet a knowledge of your connection to your surroundings.

We know that rotary and corkscrew motions are the most powerful functionally. We know that motion is better than no motion. That stagnation in anything causes death.

We know that disturbing a circular system such as an ecosystem damages it through its inability to deal with positive feedback loops.

So tell me again why we continue to use the straight line as a rule?