Pregnant women recognize other pregnant women all over the place, I'm told. A bike fiend friend can spot a Campagnolo derailleur a mile away.
Me, I sure got an eye for outhouses. Here's a communal one I saw this summer on a ferry landing. I'm not sure why it says "Baron", but there used to be a barony close by.
Aye, the common people will arise as one, one day.
Also, I'm not sure how it works, as I didn't have a chance to check. Most likely, it's either closed or they've carved out a hole so everything just plops down into the fjord. Any other technology would require maintenance, which in general is just not in vogue.