The perception of a substance, to which impenetrability is usually attributed, can as such be re-dimensioned by the application of design methods. A stone can reflect light in a thin section so that it appears transparent, and becomes a medial metaphor for the photographic glas negative, enlarged in the darkroom and reproduced on colour paper. In addition, the instructions of the laboratory research context of the sample locate the material in a history of design. Originally formed material becomes in its fine-material analysis and aesthetic reproduction once again a designed shape. Each result is in its visualisation an abstract, symbolic representation of a construction error, or its respective origin.