Denis Klatt aka HIFI(ONE) is a real child of the Ruhr Area. He was born 1978 in Lünen and as his roots are in graffiti, he is or was a member in the graffiti crews AMC and NSIS. He has studied Design at the University of Applied Sciences in Düsseldorf. In Dortmund and Bochum he 2017 has finished two thrilling murals. After his gigantic sperm whale in Dortmund at Speicherstraße, Bochum has got another one at Hermannshöhe 40.