Heidersberger, Heinrich. Orchis. Silver gelantine extract mounted on photo paper with signature, numbering and title on cardboard. 39.5 x 30.5 cm (sheet). 1976. This sheet is from the series "Rhytmogramm" by the artist Heinrich Heidersberger (1906 - 2006). Heiderberger developed the method already in the 50s. – Slightly rubbed and waved otherwise good specimen. Decorative.