The revolutionary Power-Generating Floor, works by converting physical pressure into electricity and has a wide range of potential applications. Part of the appeal of this device is that it emits no greenhouse gases or other pollutants. It consists of tiles that convert vibrations caused by people or automobiles passing overhead into electricity. Within each roughly 50-centimeter-square tile is a crystalline substance called a piezoelectric element. When outside pressure is placed on these elements, electrical polarization occurs and generates an electric potential in proportion to the amount of force applied. While output varies depending on the number of tiles, two steps by a person weighing 60 kilograms normally generates 0.1 Watts of power.