Actually, this in only part of the piece. Every day around 11h, an actress would step on Saâdane Afif’s The Soapbox and recite texts written by poets, philosophers, musicians, craftsmen and others commissioned by the artist. It was on the Schiffbauplatz. The graffiti was not on the original art work.
You can find more information about the artist and this piece, on the Art and the City official website.