more purposes. Men turned their powers to changing the forms 
of things by cultivation. Change to special production in local 
areas created the need for exchange and for transport. For this 
purpose sledges were used in Northern Europe before 5000 
B.C., and human porters and pack-bearing animals preceded 
sledges naturally. The wheel under the sledge was an 
accelerator of feet, not of hand. With this acceleration of the 
feet came the need for road, just as with the extension of our 
backsides in the form of chair, came the need for table. The 
wheel is an ablative absolute of feet, as chair is the ablative 
absolute of backside. But when such ablatives intrude, they 
alter the syntax of society. There is no ceteris paribus  in the 
world of media and technology. Every extension or acceleration 
effects new configurations in the over-all situation at once.

     The wheel made the road, and moved produce faster from