Adolf Luther (Krefeld-Uerdingen 1912 – 1990 Krefeld). Linsenobjekt. Circa 1969 Acrylic glass lenses on aluminium frame. 135 × 34 × 34 cm (53 ⅛ × 13 ⅜ × 13 ⅜ in.). With an accompanying certificate from the Adolf-Luther-Stiftung, Krefeld, dated 30.10.2018. The work is registered in the catalogue raisonné of the artist as number LSO 69 001.– [3144] Provenance: Private Collection, Germany