Arne Jacobson created the radical shape of his 'Egg' chair by sculpting it out of clay in his garage then moulding the inner shell from a strong foam composite before upholstering it. It represented a new direction in manufacturing techniques and addressed the spatial role of the chair by creating personal privacy in the otherwise exposed Royal Hotel foyer in Copenhagen.
The 'Egg' is almost unique amongst the design anthology of chairs because it simply looks better with someone sitting in it. It makes more sense, it almost seems to complete itself. Try a google image search for the Egg chair (or any other type of chair) and the overwhelming majority of chairs are presented as vacant, devoid of their function.
Perhaps a chair only really becomes a chair when someone sits in it, a bicycle when someone rides it or shoes when someone wears them.