Private Collection, Rhineland - directly from the artist The work has been registered by the Adolf-Luther Foundation Krefeld under the archive number Hsp/75/004. We are grateful to Dr Magdalena Broska for her assistance in cataloguing this work. The concave mirror objects serve as instruments. Their instrumental function is, on the one hand, by means of the many identical concave mirrors to optically multiply a given reality in the form of numerous irreal, often inverted appearances which irritate the observer, and on the other, by changing their position the observer themself inspires, as it were, an ever-changing sensation of reflection. The concave mirror objects are instruments because they reflect and react to the observer’s movements. Underlying this instrumental function lies the serial structure of the concave mirror objects, which itself has become important to minimalist art. Here the serial nature is not the common cause, but rather a function of the instrumental. (Imdahl, Max in: Honisch, Dieter ed., Adolf Luther, Licht und Materie, Recklinghausen 1978, p. 22)