The point I think Carr was getting at in chapter 3 is how the proper use of technology is instrumental in the development of an individual and society given that with the right structure it can foster maturation and intellectual growth. He used the progression of map making skills as one grows from preschool age to an adult as an example of how when one develops the way they see things and use certain tools changes profoundly. The example of how clocks are used is significant in the growth of society through structure.