Invisible Sculpture is based on a reversal of the sculptural working technique of the lost mould. Understood as a process result, each Invisible Sculpture comprises various types of materiality or medium/form variations. In order to secure the trace evidence, something totally arbitrary is placed on a working underlay and treated with colour. This initial manoeuvre is followed by the partial marking of the arbitrary item via moulding. The result from the separation of the two, i.e. the physical marking on the one hand and the subtraction of the arbitrary item on the other, is sensual data which activates the reversal. The “temporary markings” (Rosalind E. Krauss) are captured via long-exposure photographs or video.