Peter Bengtsen is giving a talk on street art in St. Petersburg on 10 April 2015. The event takes place at The Youth Educational Center of the Hermitage Museum and is arranged by the <link https: www.facebook.com streetartmuseum art>Street Art Museum. The talk is entitled "Street art and the exploration of urban public space". It will discuss some of the central characteristics that enable street art to challenge the meaning and use of public space. This is a theme Bengtsen discusses at length in his book <link https: www.academia.edu bengtsen_p._2014_._the_street_art_world street art>"The Street Art World" (2014). Some of the points covered in the lecture can also be found in his article <link http: www.tandfonline.com eprint cep4axaapnn4zje7keun full the public art>"Beyond the Public Art Machine" (2013), currently available as Open Access.