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The technology behind telecommunication.
Today everything happens inside your router, fast and silent. My father was a telecommunications engineer. When I was a amall boy (late 1980s) he once took me to his workplace (it was in the evening and he was supposed to troubleshoot). What today fits onto a few silicone chips inside a router took much more space back them.
I was in a room that was filled with several wardsobe-sized cabinets. Inside there were hundreds of electro-mechanical relays that were in motion, spinning and clicking, each time someone in the city dialed a number (back then rotary phones were quite common). It was quite loud. There also was a phone receptor inside one of the cabinets where one could tap into an established connection, listening into the conversation two strage people had (it was for checking if a connectiion works).
I still remeber the distinct "electrical" smell of that room (probably hazardous vapors from long forbidden cable insulation and other electrical components).
So when you dialed a number at one place with your rotary phone, you were able to move some electro-mechanical parts at another place that could be located somewhere else around the globe (hence long distance calls).
At my job we recently had an old device that was used to produce the sound a phone makes when the line is busy, open, etc. . It's about arm length and 20 cm thick, you can distinguish the cogs producing the phase from the signal.
My grandmother was a switchboard operator at one point in her life. She saw a scene in Mad Men and said they left didnt get the sound right but it might as well have been where she worked