Joseph Beuys, Fat Chair, 1964
Wooden Chair, fat and wire.

"My initial intention in using fat was to stimulate discussion. The flexibility of the material appealed to me particularly in its reactions to temperature changes. This flexibility is psychologically effective - people instinctively feel it relates to inner processes and feelings. The discussion I wanted was about the potential of sculpture and culture, what they mean, what language is about, what human production and creativity are about. So I took an extreme position in sculpture, and a material that was very basic to life and not associated with art..."