In his work "Last Exit" 100 meters of typical roadside crash barriers were integrated in the exhibition room in a curvilinear infinite loop. On the occasion of the 400th anniversary of the founding of Mannheim he arranged the installation “Field Flowers” 2 throughout the citycentre. 400 (1m x 1m) squares of plants and flowers seemed to be growing out of the city's paving and sidewalks. The squares appeared at random but were strategically placed amidst pedestrian traffic and impact in an endearing way. His “Whipped through Customs” installation at the Brandenburg Gate in Berlin is within the meaning of performance art. 100 adolescents sat gloomily inside typical carry bags used by immigrants with their hands tied. In this artistic way Feckelstein wanted to draw attention to the status of asylum seekers in Germany. The year 2009 was characterised by post-communist social changes in Russia and the Ukraine. These events were thematised by Fleckenstein with a “Freedom” exhibition at the Museum of Non-Conformist Art in St. Petersburg and the “Homage to Sergei Eisenstein” exhibit on the Potomkein steps in Odessa. In 2011 a big solo exhibition took place in the "Museo d'Arte Contemporanea - Villa Croce" in Geneva. "Lost in View" was the title of the exhibition in which spatial illusions caused visitors to mistrust their own visual faculty. Sociopolitically motivated installations and projects in public space get more and more important in his artistic practice. With installations in the Ukraine and at the Museum Kulturspeicher he takes a stand for the struggle for freedom of the Ukrainian people. In a film displayed at the fassade of the WRO-Art Center in Wroclaw in 2012 - the year of the European Football Championship - he dealt with German history. The topic of the film were the crimes committed at Babyn Jar in Kiev. These were artistically broached within a football game between naked players and players in a German tricot. With his installation "I believe in God" in front of the Frauenkirche (Church of our Lady) in Dresden in 2015 he received nationwide attention. There, he displayed 75 prayer-rugs on the fore court of the church in order to stand-up against Pegida and to promote freedom and tolerance in Germany. Even though there are no historical or family roots, Fleckenstein devoted himself in the early 1990s to the changing social situation in Poland and established cross-border ties.