@neauoire Networks of trust were personal long before they were electronic. :)
Though I agree. Maybe we should start looking into mechanical computing.. Wooden Turing machine, anyone? https://youtu.be/vo8izCKHiF0
..or whatever the model of computation https://xkcd.com/505/ is.
@wryl You might like the various ideas of paper computing(WDR, Cardiac, etc), and fluidics too :)
https://wiki.xxiivv.com/site/paper_computing.html