I've only seen postcards of this artist's work ( and web images which are a bit too small to get the real effect). His work is in the same basic style as Andy Goldsworthy - Environmental Art, but differs in the greater complexity and naturality of the images. Whereas Goldsworthy's images concentrate on the simplicity of the manufactured structure, some, but not all of Udo's work shows broken symetry, complex natural scenes and the use of a large range of materials in a single piece.

• Collection of (small) images - http://www.bartschi.ch/stk_nu.html
• Analysis of his work and approach - http://www.sculpture.org/documents/scmag99/sept99/nils/nils.htm
• Profile ( auf deutsch, Translated to English )