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For more than one decade the dominating materials in the artistic work of Wolfgang Trettnak have been acrylic colours and acrylic pastes. These materials allow for the creation of relief-like surfaces and the integration of a large variety of materials, such as e. g. wood, cord, zips or electronic components, into the painting. Therefore, the resulting works very often rather resemble collages or assemblages than paintings. Besides acrylics, oil and tempera colours play a certain role, when special effects such as high transparency and colour depth are required.