Fig. 8 Gerrit Rietveld, From left to right: Zig-Zag Chair (prototype, 1st version), 1932; Zig-Zag Chair (prototype, 2nd version), 1932-1933;  Zig-Zag Chair, 1932-1933, manufactured from 1932-1933 onward, under the control of Metz &amp; Co., Amsterdam