After this exhibition he went on to further study, and modify, the 'Techniques of the Old Masters' to his own purposes in a selection of work he called Ideas of Truth, and his portfolio The Missing Weapon, which was shown at the Gallery Bernard in Solothurn, Switzerland, in 1968.
De Es moved to SoHo, New York City in 1975, continuing his Stone Period of art work.
To celebrate the new millennium De Es produced another 100 Planetarians which appeared on a mountain site next to Vienna during the summer of 2000.
As the result of the process of painting the Planetarian Sculptures', emerges a new dynamic style which focused on streaming energy-patterns and elemental space-systems which he calls Architexturen.
Surprisingly in 2015 De Es Schwertberger started to animate the theme of the Stoneman again in the painting series Neolithics.
De Es shows his works permanently in the Sinnreich', his museum and gallery in Vienna, Austria.