Helmut Amann’s geometric wall reliefs play with perceptions in an optical sense, using color and shape to imply depth and movement where none exist. Each element is painted and inscribed to suggest three-dimensional structures, although they are actually almost flat. Almost, but not quite. They are also almost all the same, but subtly varied within each grouping, creating a captivating progression of gradual metamorphosis from one form to the next.
http://www.nytimes.com/1996/09/15/nyregion/esthetic-alchemy-and-surprising-photos.html
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http://www.helmutamann.com/