ZERO - Zero 4321. Published by Dirk Pörschmann and Mattijs Visser, Zero Foundation Düsseldorf. With two limited and singed serigraphs by Heinz Mack and Otto Piene. Düsseldorf, Richter-Fey, 2012. 20 x 22 cm. OKarton (still orignal sealed). Special edition of 100 copies, with the two separate original serigraphs, each number 56 of 100, signed by the artists. - Enclosed reprint of ZERO 1 to 3 with accompanying volume, for the exhibition ZERO Paris-Düsseldorf, 2013. Further enclosed silver cardboard sheet with cutout "ZERO", as well as unsigned double sheet with lithograph and burn hole in protective cover (Otto Piene ?). - As good as new. This object marked with * (asterisk) is fully subject to VAT, i.e. for these objects VAT will be charged on the hammer price plus buyer's premium. Buyers who present a legally stamped export declaration will be refunded the VAT.