Cycling to France in Switzerland!

Today I cycled around 80k, going to the Swiss town of Delemont and back, via Laufen. The strange (but not unusual) thing here in Switzerland is that you stay in the same country but the whole environment changes. You see, Delemont is at the edge of the French part of Switzerland - so suddenly the signs change from German to Swiss, but it's an intagible change. There is no border between the two distinct parts of the same country - it's just different.