The Folk art form reached another level of its evolution with the development and maturity into a Pop art form consisting of pointillist Cube Art renderings. The street artist who uses the alias "Invader" or "Space Invader" started exhibiting pointillist pieces, including one of a man behind a desk and Mario Bros, using Rubik's Cube in June 2005 in an exhibition named 'Rubik Cubism' at Sixspace in Los Angeles.[29] Prior to this exhibition the artist had used Rubik's Cubes to create giant Space Invaders.[30] Another artist includes Robbie Mackinnon of Toronto Canada[31] with earliest published work in 2007[32] who claims to have developed his pointillist Cube Art years earlier while being a teacher in China.