A quadripoint in the Polish Corridor

I previously brought this up as an off-topic suggestion so let me create a new topic today.

Due to the mixed ethnic composition of the northern part of the Polish Corridor, it could have been bottlenecked into a quadripoint where:
- Mainland Germany lies in the west and East Prussia in the east;
- Mainland Poland lies in the south and Kashubia in the north.

Both countries become contiguous in one point. Of course no person, car or train can squeeze into a single point so a two-level infrastructure (like a bridge or a tunnel) on that point is in order, with each country controlling one of the levels.

In what way is this different from simply giving to one country extraterritorial passage through the other's sovereign territory?

Under the quadripoint scenario...
1) both countries are co-dependent.
2a) contiguity is perceived on a map, somehow limiting irredentist feelings amongst the general public.
2b) contiguity will be experienced as one will travel from one part of the quadripoint to the other not only without passing through a checkpoint but by never leaving its own country. For a few seconds the traveller will know that he or she would be in an infrastructure whose other level is under foreign control but it would be just a meaningless curiosity.
 
I previously brought this up as an off-topic suggestion so let me create a new topic today.

Due to the mixed ethnic composition of the northern part of the Polish Corridor, it could have been bottlenecked into a quadripoint where:
- Mainland Germany lies in the west and East Prussia in the east;
- Mainland Poland lies in the south and Kashubia in the north.

Both countries become contiguous in one point. Of course no person, car or train can squeeze into a single point so a two-level infrastructure (like a bridge or a tunnel) on that point is in order, with each country controlling one of the levels.

In what way is this different from simply giving to one country extraterritorial passage through the other's sovereign territory?

Under the quadripoint scenario...
1) both countries are co-dependent.
2a) contiguity is perceived on a map, somehow limiting irredentist feelings amongst the general public.
2b) contiguity will be experienced as one will travel from one part of the quadripoint to the other not only without passing through a checkpoint but by never leaving its own country. For a few seconds the traveller will know that he or she would be in an infrastructure whose other level is under foreign control but it would be just a meaningless curiosity.

I don't think the reality of the distribution of the population will allow it to be honest. However, I would suggest that if such a point had to be made, somewhere on the Preußische Ostbahn would be the obvious point.
 
I don't think the reality of the distribution of the population will allow it to be honest.

In fact. You'd still have Polish minorities in Germany and vice versa, wherever you place the point of intersection. Additionally, you'd still have Danzig as a free city under the LoN aegis. In other words, you still have plenty of fuel for nationalists' fires.
 
I don't think the reality of the distribution of the population will allow it to be honest.

Nor was it supposed to be a clean ethnic boundary. OTL's Corridor wasn't, the populations are too mixed in these areas. Any line you choose will leave this or that ethnic German enclave in Poland and ethnic Polish enclave in Germany.
The point of this proposal was not about putting more (or less!) Germans in Germany and Poles in Poland, it was about a compromise that would 1) allow Poland to independently reach the sea while 2) having Germany and Poland contiguous and 3) still roughly respecting the general ethnic map.

you still have plenty of fuel for nationalists' fires.

Certainly! It's not meant as a magic panacea... ;)
 
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