Fifty miles north of Frankfurt lies the small German town of Solms. Turn off the main thoroughfare and you find yourself driving down tranquil suburban streets, with detached houses set back from the road, and, on a warm morning in late August, not a soul in sight. Nobody does bourgeois solidity like the Germans: you can imagine coming here for coffee and cakes with your aunt, but that would be the limit of excitement. By the time you reach Oskar-Barnack-Strasse, the town has almost petered out; just before the railway line, however, there is a clutch of industrial buildings, with a red dot on the sign outside. As far as fanfare is concerned, that’s about it. But here is the place to go, if you want to find the most beautiful mechanical objects in the world.