The face and dots-patterns beside are typical artworks of Oz at the train bridge. Oz aka Walter Josef Fischer *1950 in Heidelberg; †25. September 2014 in Hamburg was a famous sprayer and "grandpa of the sprayer-community". He spend several time in jail due to taging Oz at plenty walls. Still there are his smileys, patterns and letters to see along train lines, under bridges etc. Finally he had an accident with a train "at work". Often you can find "Oz" on many new graffitis and street artworks as a tribute to him.

https://onezeromore.com/