Most city building usually owes their origin to a plan or blueprint. Similarly every device and machine within individual buildings. From heating systems. Air conditioning, kitchen devices, lifts and other electrically powered devices. All begin life as a schematic drawings outlining how various elements interact to achieve their purpose within the building. Within all those devices are microchips ie more schematics
Here is part of the schematic for the first microprocessor or cpu designed for Intel by Federico Fagin. The 4004 was completed in in 1971. It was a game changer.
