Wenn unser höchstes Gericht in Karlsruhe schon mal baut, dann muss auch der Zaun anspruchsvoll, in diesem Fall sogar ein Kunstobjekt sein. Woran man das erkennt? Hm...
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When our highest court builds, the fence must also be sophisticated, in this case even an object of art. How can you tell? Hm...

Translation of the sign:
Building Fence Federal Constitutional Court
A cooperation between the Federal Constitutional Court, the Baden-Baden State Building Authority and the Karlsruhe State Academy of Design.

They all worked together for this beautiful construction fence, sorry - art object. :-)