In my simplifying things, I’ve reduced 5 allotropes to one per object and continue with the easy to iterate Zazzy experiment beginning with a simple graphite necklace.
Graphite is an arrangement of carbon atoms (called an allotrope). It has layers of carbon rings which slide past one another, making it soft. It is pencil lead; and used in your bike chain to make it smoother to turn. If you arrange the carbon atoms so they are cross linked across layers, you get diamond, one of the hardest materials in nature. Both are made of the same carbon atoms.
A nice metaphor to describe how small microscopic changes can have a tremendous impact on a large scale.