The Bielefeld plot

This one goes to my dear friend Kerstin, she's from Bielefeld.
With 333,000 inhabitants and a size of 258 square kilometres it ranks among the 20 biggest cities in Germany.
It was mentioned in the song "Pro Familia" of one of the leading intellectual bands in Germany Blumfeld (I'm a fan!):

Back to Brake, Bielefeld, Haus der Geschichte
in den Garten der Erinnerung
zu den Bäumen und den Früchten
meinen Ängsten, meinen Träumen


But obviously it can cause nightmares for little boys, too.

Translation of the picture for the English people:

Mum: Listen Tobias! Mum and dad are in a witness protection program. Therefore we have to move to a place of which nobody knows that it exists.

Tobias: To Bielefeld??

So, Kerstin, can you explain?