Written on the wall

Just arrived, the first thing you see on the railway station in Luxembourg City, in the richest country in Europe...

Explanation: defence d'uriner = pissing prohibited (EN), zakaz sikania (PL)

Other interesting graffiti (in Limpertzberg):

English translation: "Nothing is Real, Everything is Permitted".

But unfortunately the nihilistic effect is spoiled by this smiley...