|A Brief History of the Earth. Part 1.|
Stone, steel, copper, linen, seed.
|Part 2. (minus linen, added cotton and wood)|
|Part 3. (linen)|
|Part 4 (added gravity)|
|Part 5. (added silk and gravity)|
|Part 6. (added gravity, old rail spike and sea urchin part)|
Found objects, starting with stone and developing.