Kleines Vibrations-Relief. 1971. Object. Metal foil on aluminum plate. Mounted in object box. Signed and dated in lower center. Verso signed, dated, titled and with arrow indicating the direction. Ca. 33 x 32 cm (12.9 x 12.5 in). Object box: 51 x 44 x 6,5 cm (20 x 17,3 x 2,5 in).
Accompanied by a written expertise issued by Prof. Heinz Mack from March, 2015.