Copper
One fantastically hot and sunny car-booting day in Redcar, I came across a family who looked, judging by the various sized tables all manner of trinkets were sitting on, as if they were abandoning every single item they owned, in the spirit of Michael Landy.
Iron
IRON forms the core of our planet, and is used to make steel (IRON+ CARBON), used to make stainless steel (IRON + CARBON + CHROMIUM).
Steel in turn is used to make things from paperclips to skyscrapers.
