Zig-Zag” appears to completely contradict our ideas of a usable piece of furniture since its free-standing surfaces appear to collapse as soon as any weight is placed on them. However the chair is stabilized by dovetail joints between the seat and back, reinforcements with screws and nuts, as well as wooden wedges in the corners. Rietveld was very much aware of the discrepancy between the simple shape and the relatively complicated construction and said himself, it is not a chair but a “designer joke.”