"Dieter Walter Liedtke's Concrete Evolutionism opens up a new revolutionary world to the viewer. He shows how matter, which until now has only been the object and medium of artistic representation, could in turn perceive its surroundings. This information has a consciousness-expanding function." 

Prof. Karl Ruhrberg, 1998
Art historian and art book author former Director of the Museum Ludwig Cologne President of the Intarnational Association of Art Critics
(German Section, AICA) Código Universo Art Exhibition Advisor 

"This art formula, as the core of the exhibition concept of art open, not only fascinates art connoisseurs, but also contains statements of high explosiveness for natural historians." 

Prof. Dr Friedemann Schrenk
Professor at Frankfurt's Johann Wolfgang Goethe University, Research Prize of the Collège de France, Grüter Prize from the Stifterverband für die Deutsche Wissenschaft, Deputy Director of the Hessisches Landesmuseum Darmstadt, 
Communicator Award of the Media for German Scientists, Federal Cross of Merit of the Federal Republic of Germany 

Lender of the special exhibition in the art open: The Innovations and Developments of Early Man.

"Dieter Liedtke is ideology-free positive energy, thoroughly creative and a work of art himself. In him, Leonardo da Vinci has found a successor." 

Prof. Dr. Harald Szeemann
 Art historian and director of the Documenta (1972), Bienale de Lyon (1997) 
Bienale di Venezia (1999 and 2001) 
Advisor of the art open art exhibition 1999 in Essen 

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