In Essen there are some walls everyone can spray on spontaneously and without asking for permission. This HoF is one of those you have to ask for permission. That is why it's face doesn't change that often.  It is situated in the north side of Essen, in Borbeck. You can take a suburban train S9 to Bottrop or tram 103 to Wertstraße. Leave the train/tram at Borbeck station and walk parallel to the railroad. At the end of the road take the bike- and footpath.