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.
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De Es was born in 1942 in Gresten, Lower-Austria, as Dieter Schwertberger, the second son of two teachers.