value

価値　—　Phenomena

How much a thing is worth.

Knife money — A photograph of what this word names.

Franc à cheval (the franc on horseback) — A photograph of what this word names.

⚠ The value of a currency has at least three layers: its value as a material, its value as a denomination, and its value in that "everyone will accept it."

When these three align, nothing happens. When they diverge, history is made.