The Saverne has a unicorn fountain. There is also a unicorn in the coat of arms of the city. The horn is the spiral.
The Agen-Carignan line is orthogonal to the Carignan-Saverne line.
I like the idea that semaphores are Sentinels. When you stand in front of one, you will see the previous and the next. You see all three. But … the Madits say the Sentinels are not mechanical.