"Liedtke's creativity formula is an evolutionary achievement. Once invented and introduced, it enables itself.  

Prof. Niklas Luhmann, 1986 
Art historian and philosopher Bielefeld University 
Advisor to the art open art exhibition 

"The visualisation of the evolution of the arts, through Dieter Liedtke's art formula or Código Universo, across national borders and time periods, will open up new perspectives and enable a fresh, unused view beyond all routine and beyond the limits of the usual view of art. In this way, the permanent evolution of the arts, which, after all, beyond all cliché notions of the alleged revolution, was and is a long, still ongoing path pointing to the future, can become a visually comprehensible experience." 

Prof. Karl Ruhrberg, Cologne 1997 
Director of the Museum Ludwig (Cologne)President of the International Art Critics Association (German Section, AICA)
Advisor to the art open art exhibition 

"The formula, of Leonardo da Vinci today, is the revolution in art history.  Liedtke wants to make creativity thrusts directly visible through the image, through the images, make it comprehensible. His art open art formula, life + expansion of consciousness = art, is in a sense the condensate of his research, which he has explained in various publications: The Consciousness of Matter (1982), The Fourth Dimension (1987), the key to art (1990)..." 

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

"Liedtke's formula is a binary formula and it is reminiscent, especially in the artist's intelligent graphic version, of the formula of Albert Einstein's theory of relativity, the correctness of which is proven again and again and long after it has been formulated, because formula carries future within it and does not see itself as the conclusion of thought. -Through the works of art, it incorporates the realities of the past as well as those of the present and the future, which will contribute to the expanded understanding of a work of art and liberate it from its ties to the present. Liedtke's formula is an extension of human thought and understanding. It does not formulate a prescription for art, but rather conveys a better way of dealing with art. - "For Dieter Liedtke's thinking, these considerations are not unimportant, especially since he likes to be compared again and again with Beuys, as the new Renaissance artist (Dieter Liedtke in the footsteps of Leonardo; Welt am Sonntag 1995) as the second Beuys, who wants to revolutionise society with his art. “ 

Prof. Dr Dieter Ronte, Bonn 2020
Director Museum of Modern Art Vienna, 
Sprengel Museum Hanover, Kunstmuseum Bonn
Art historian / consultant of the new international travelling art exhibition: i = E = MC²