This is called a laser. Once all the waves of light are in step, you can vary them in a controlled way to send messages. Perhaps the best symbol for our new age of electricity is the space satellite powered by tiny photovoltaic cells which use the sun's energy to generate electrical currents. These satellites contain miniaturized and powerful computer memories, sensitive receivers and transmitters. Satellites are fast converting spaceship earth into a true global village.
Electricity is power.
Electricity is information. Electrical power lines are linking city with city, country with country, continent with continent in ever more powerful systems. And satellite, computers, radio, television, fiber optics, data transmission links are multiplying in ever more complex and powerful systems of information, of knowledge and delight. A linkage that is a kind of extension of the human body and the human brain. Operating rules for small spaceships.