Adolf Luther, Hohlspiegelobjekt (Concave mirror object), 1970, 8 x 8 square mirrors on black wooden plate in metal frame , 151 x 151 x 6 cm, Photo: Archive, Adolf Luther, Materiebild (dark matter piece), 1961, Matter of colour, chalk and pigment on wooden plate, 43.5 x 64 cm, Archive, Adolf Luther, Materiebild Schwarz (Dark matter piece), 1959, Matter of colour, chalk and pigment on cardboard, 60 x 83 cm, Photo: Marcus Schneider, 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, Lichtmaschine (light maschine), 1962, Steel, 29 x 9 x 10 cm, Archive, Adolf Luther, Lichtschleuse (light trap), 1962, stripes of glass in between glas planes in aluminium frame, steel, 50 x 31 x 13 cm, Archive, 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, Der Fokussierende Raum (The Focus Room), 1968, 41 concave mirrors, frame, motor drive, spotlights,  2 x 2 m, © Archive Adolf-Luther-Foundation, 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, Lichtharfe (light harp), 1966, Semitransparent concave mirror stripes, acrylic glass, 27 x 44.5 x 7 cm, Photo: Marcus Schneider, Adolf Luther, Hohlspiegelobjekt (Concave mirror object), 1970, 3 x 8 serial semitransparent tinted concave mirror strips (each 11,5 x 12 cm), acrylic glass, 107 x 107 x 8,5 cm, Photo: Archive, Adolf Luther, Struktur für Licht (Structure for light), 1962, Eggshells, gesso, oil and pigment on wood, 54 x 54 x 10 cm, Photo: Archive,