Not least since the extensive retrospective shown in Berlin in 2015, considerable interest has surrounded works by members of the Zero group of artists. They regularly top the results lists at sales of contemporary art throughout Germany and Austria.
The market favourites are the founders of the group: Otto Piene, Heinz Mack and, above all, Günther Uecker, whose nail paintings regularly change hands for six- and, on occasions, seven-figure prices.
The €1.17m (£1.04m) achieved by Ketterer in December for his Zärtlicher Garten (see main story) is the fourth-highest auction price for one of Uecker’s works.