Adolf Luther, Hohlspiegelobjekt, 1969, 64 concave mirrors, aluminium, acrylic glass, 110 x 110 x 7 cm, Photo: Marcus Schneider, Adolf Luther, Lichtschleuse (light trap), 1962, Stripes of glass in between glass plates, aluminium frame, steel rack, 51 x 38 x 14 cm, Photo: Inka Recke, Adolf Luther, Sphärisches Hohlspiegelobjekt, 1990, Semitransparent concave mirror, acrylic glass, 40 x 40 x 9 cm, Photo: Marcus Schneider, Adolf Luther, Struktur für Licht (Structure for light), 1962, Eggshells, gesso, oil and pigment on wood, 54 x 54 x 10 cm, Photo: Archive, Adolf Luther, Hohlspiegelobjekt, 1982, 122 concave mirrors, silver, , 71,5 cm x 71,5 cm, Photo: Marcus Schneider, 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, Lichtschleuse (light trap), 1964, Stripes of glass between glass plate, aluminium frame, steel rack, 50 x 14 x 25 cm, Photo: Archive, Adolf Luther, 2 Hohlspiegelobjekte, 1979/80, Mixed media, 77,7 x 77,7 x 15 cm each, , Adolf Luther, Hohlspiegelobjekt, 1969 , 64 concave mirrors, aluminium, plexiglass,, 110 x 110 x 7cm, Photo: Marcus Schneider, Adolf Luther, Stehlinsen (Lens on metal foot), 1970, Concave mirror, semitransparent, synthetic framework, steel pole, 51 cm diam, ca. 220 High (each), , 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, Lichtharfe (light harp), 1966, Semitransparent concave mirror stripes, acrylic glass, 27 x 44.5 x 7 cm, Photo: Marcus Schneider, Adolf Luther, Hohlspiegelobjekt, 1967, 25 concave mirrors, aluminium, glass, 60 x 60 x 9 cm, Photo: Marcus Schneider,