To accomplish anything in the suburbs, you need to get in your car and drive to another address. Downtown, in a skyscraper, you just use an elevator.
Elevators are more efficient -- and the semiconductor industry has taken notice (metaphorically speaking) with a trend toward 3D chip design. Instead of putting dies in separate packages, soldered to a circuit board and sending data through their I/O ports to other chips (i.e., driving through the suburbs), dies are stacked and data is moved from one layer to the next (i.e., via the elevator).
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