Have you ever been in a situation where you're having rare guests over who've come from afar. Meeting them and saying goodbye to them are big things because you meet very rarely. On the day they leave, you have to leave several hours earlier in the morning than them. In fact, you have to wake up at some stupid hour like four am. Your guests having to wake up at that hour just to say goodbye to you wouldn't make sense so you say goodbye in the evening right before you all go to bed. After ten minutes of smiling, hugging and handshaking, talking, getting invitated to visit them etc., you disperse and all go to bed. When you have said your goodbyes, you're guests are as good as gone to you, socially.
But your guests could be sleeping in the next room. You might hear them snore. They would be physically very close but socially as good as on the opposite side of planet at the same time. Would you feel awkward if you and one of your guests bumped into each other in the hallway on the way to the bathroom if nature were to call you both at the same time?
The above is but one example of a mismatch of different topographies. Berlin during the Cold War had tons of them. Here's an article about Berliners with their apartments stuck on the eastern side escaping to the West through their windows while the street and the sidewalk underneath their windows was in the West. The first one to escape that way jumped out of her window and died on the way to the hospital. A completely arbitrary line was drawn in the middle of a neighborhood between a free and a totalitarian state.
By User:Jérôme - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1564073
One part of the international border in Baarle-Nassau goes straight through at least one apartment.
The border between Belgium and the Netherlands is very strange in some places. There are apartments that have an international border going right in the middle of them. Suppose a crime, say, domestic violence takes place in such an apartment. According to which laws will the crime be prosecuted? Will that depend on which room or which exact place the first act of physical violence was committed? What if the perpetrator stood right on the border when he committed the crime? What if there is a prolonged fight during which both parties moved around, crossing the border multiple times?