People and Machines
People are tool builders.
People make and use tools all the time.
Some tools, when used, need continual attention.
These tools are operated by people.
Automation
Other tools can be set in motion and then run by themselves.
Exercises
- Tools that need your continual attention while you are using them: a hammer, a bicycle, an automobile.
- Tools that you can start in motion and then they operate themselves: a dishwasher, an oven, a clothes dryer.