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A comment on Ask HN: Most interesting tech you built for just yourself?. Parent comment

Re:Ask HN: Most interesting tech you built for just yourself? by uuuuuuuuuuuuuuu on Saturday April 29, 2023 @02:24AM (#35750533)
I got confused at first too. What he means is "somewhere outside on the ground level while my apt is not on the ground level, there are trains passing by which I can see from my apt". You need line of sight.

This is not mysterious tech deriving images from sound traveling through the floor. You will be out of luck with your underground subway.

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Re:Ask HN: Most interesting tech you built for just yourself? by 6510 on Saturday April 29, 2023 @10:43PM (#35759281)
If you have the schedule and the sound I'm sure you could make a cam with translucent ground. You should be able to figure out where it is, which model and how long it is. Who knows, maybe the orchestra of break sounds (it has many) is unique enough to spot which it is exactly.
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Re:Ask HN: Most interesting tech you built for just yourself? by ilyin on Monday May 01, 2023 @06:03PM (#35779827)
A fun fact is that there is a monorail station built in the middle of a residential building, so it might also be literal.

https://en.m.wikipedia.org/wiki/Liziba_station

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