In February 1965, Nees showed - as works of art - the world's first computer graphics created with a digital computer. The exhibition, titled "computer graphik" took place at the public premises of the "Study Gallery of Stuttgart College". In 1966, he started to work on "computer-sculptures". In the catalog of the Biennale 1969 Nuremberg, Nees describes how the computer program controlled the milling machine so that instead of a workpiece, a sculpture was created. Three painted wooden sculptures and several graphics were shown at the Biennale 1969 Nuremberg. In 1970 at the 35th Venice Biennale his work was part of the special exhibition "Research and Design. Proposals for an experimental exposure" and showcased his sculptures and graphics of art and architectural design.