Barbed Wire Telephone
Do It Yourself Telephone (and Telegraph) systems were set up by farmers on runs of barbed wire fence in places where Ma Bell hadn't yet meted out her monopolistic reach.
https://gizmodo.com/barbed-wire-fences-were-an-early-diy-telephone-netwo...
I was looking for images of this to illustrate a new article on music and information theory that will be up on my sothismedias.com website soon. I thought this piece I linked to here would be of interest to Green Wizards.