The custodian example is a good one to look at. We tend to think of the automation as a sort of Rosie the Robot coming in and doing all the things the custodian

The custodian example is a good one to look at. We tend to think of the automation as a sort of Rosie the Robot coming in and doing all the things the custodian once did. That's probably not the way the janitor's job gets automated, though. Think of self-cleaning toilets and sinks, industrial Roombas mopping and vacuuming the halls, glass-cleaning robots moving from window to window, and a trash-collecting robot emptying the bins. There's still the edge cases of course. Clogged toilets or adhesive gunk on the windows for example. But where a janitorial crew was required before, now just one janitor handles those while all the routine cleaning is automated by specialized tools.