Man builds objects for meet his needs and improve his quality of life. If you look around you, you can see that the majority of this objects have or produce some kind of movement with a purpose, like: clear the clothes, indicate the time, move people...
Here we have the example of a coffee grinder. It has a simple operation and it´s based on a lever on the top that turns gears of the machine and the grains of coffe become pulverized. The result is collected in a drawer and it´s ready for be taken in a cup of coffee.
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