Adolf Luther, Adolf Luther, 1968, mixed media, 45 x 45 cm, , Adolf Luther, Sphärisches Hohlspiegelobjekt (beleuchtet), 1979, 8 x semitransparent mirrorstripes,  1 flat mirror, plexiglass, flourescent lamp, 40 x 40 x 16.5 cm , Signature: Luther 79, Stamp: Sehen ist schön, Photo: Archiv Adolf-Luther-Stiftung, Krefeld, Adolf Luther, Hohlspiegelobjekt mit Licht, 1974, Semitransparent concave mirror, in acrylic glass box, 62 x 62 x 16 cm, Ø 60 cm , setform.de, Adolf Luther, Hohlspiegelobjekt, 1967, 49 square concave mirrors with chamfered edges on mirror surface , 53 x 53 x 8 cm, setform.de, Adolf Luther, Kinetisches Spiegelrelief, 1974, 13 over 12 round concave mirrors over 16 square mirorrs (with rounded corners), mounted on a black wooden plate. With electric drive, transmission belt and acrylic glass hood, 104,5 x 104,5 x 17,5 cm, Photo: setform.de, Adolf Luther, Kinetisches Hohlspiegelobjekt (Kinetic concave mirror object), 1974, 5 x 5 concave mirors on 4 x 4 concave mirrors, wood, acrylic glass, electric motor, 78 x 78 x 18 cm, Photo: Marcus Schneider, Adolf Luther, 'Zwei Brennpunkte', 1968, 2 layers of 16 square concave mirrors (in 2 sizes: 17 x 17 cm on 35 x 35 cm) mounted on a black wooden plate, with acrylic glass hood, 150 x 150 x 11 cm, Photo: setform.de, Adolf Luther, Hohspiegelobjekt, 1969, 3 x 3 semitransparent concave mirror lenses and flat mirror in acrylic glass box, 118,5 x 118,5 x 5 cm, , Adolf Luther, Stehlinsen (Detail), 1977-78, Concave mirror, semitransparent, synthetic framework, steel pole with foot, ∅ 60 cm, height ca. 240 cm, Photo: Archive, Adolf Luther, Stehlinsen (Lens on metal foot), 1970, Concave mirror, semitransparent, synthetic framework, steel pole, 51 cm diam, ca. 220 High (each), , Adolf Luther, Sphärisches Hohlspiegelobjekt, 1990, Semitransparent concave mirror, acrylic glass, 40 x 40 x 9 cm, Photo: Marcus Schneider, Adolf Luther, Hängelinse, 1978, Concave mirror, semitransparent, synthetic framework, wire, Ø 75 cm x 12 cm, setform.de, Adolf Luther, Adolf Luther, 1975, mixed media, each 75 cm diameter, , Adolf Luther, Salinas (Ibiza), 1974, Photo on concave mirror stripes in acrylic glass box , 28,5 x 51 x 7,5 cm, setform.de,