The monetary system used in Erezi evolved from the Calanzian system, which was cunningly devised to stop forgery, and based on the overriding principle in scientific thought at the time: geometry. Unfortunately the system requires highly skilled minters who have training in the art of geometry and gem-cutting.
There are five different coins:
The miro, a tetrahedron about a centimetre in height which is worth very little. Ten mirii might buy you a loaf of bread. The material for these coins is either copper or bronze. A beggar might be lucky to reap more than five mirii in a day.
The ricento, a cube, also only a centimetre in height, worth fifty mirii. They are made of bronze and engraved with the stamp of the minters' guild. A manual labourer might earn three ricento a week.
The cedito, an octahedron of bronze, worth between four and five hundred mirii depending on its condition. Typically one cedito will buy a pair of shoes or a book. A shopkeeper might earn one cedito a week.
The librento, a dodecahedron of silver, worth between twenty and fifty of the highest valued ceditii. These only enter into the hands of the most opulent middle classes: the restauranteurs and scribes, the skilled craftsmen who might charge five librentii for carving a bed or ten for a violin.
The talento, an icosahedron, also of silver. The extreme difficulty in crafting one of these is the key to stopping forgery. They are only owned by the merchants in their palaces, and are worth hundreds of librentii.
The Inscribed Solids
This system, using what we would call the Platonic solids (known to the Erezians as the "inscribed solids") developed in the early days of the Kingdom Calanz, though only three of the solids had then been discovered. The renowned genius Cardo Massaglia discovered the further shapes in 1073, as he (in his own words) "awoke from a dream of utmost beauty. I had been wandering in a fresh and springtime forest towards the water's edge when I came upon a floating body, a twelve-sided 'cube'. As I reached out to touch it, it seemed to shatter, and I was overcome with an appalling feeling. Only after I saw what it had become did I appreciate it with awe. Now there floated a twenty-sided shape and I could conceive of it." He wrote this in his diary the nest morning and drew the bodies he had seen, demonstrating that they could be inscribed inside one another just as the cube and octahedron.