ZERO Otto Piene Blue Quake. 1977. Colour lithograph on wove paper. 82.5 x 54 cm (82.5 x 54 cm). Signed, dated and numbered. With annotation in pencil by an unknown hand verso. - Partially with barely noticeable creases in sheet margin, verso with slight surface soiling. Overall very good. Splendid and colourful impression of the full-format image. Not in Rottloff. - One of 100 copies. - Published by Erker Presse, St. Gallen (with the dry stamp). Colour lithograph on wove paper. Signed, dated and numbered. On verso with annotation by another hand in pencil. - Partially with barely noticeable crease marks, on verso with slight stains. Overall very well preserved. Splendid and colour-rich impression of the full size depiction. - One of 100 copies. - Published by Erker Presse, St. Gallen (with the dry stamp). 1000