city of Pforzheim, belong.

The city was planned with the palace tower (Schloss) at the center and 32 streets radiating out from it like the spokes of a wheel, or the ribs of a folding fan, so that one nickname for Karlsruhe in German is the "fan city" (Fächerstadt). Almost all of these streets survive to this day. Because of this city layout, in metric geometry, Karlsruhe metric