[ Hannover ] { flow: down; } --> { start: south; } [ Aachen ], [ Berlin ], [ Cuxhaven ]
  --> { start: south; end: south, 0 } [ Zwickau ] { origin: Hannover; offset: 2,-2; }

[ Aachen ] { origin : Hannover; offset: 0,2; }
[ Berlin ] { origin : Aachen; offset: 2,0; }
[ Cuxhaven ] { origin : Aachen; offset: 4,0; }