Prisma is a reasonably flat island, half settled, half 'wild' to maintain hunting and farming ground for the citizens.
The island itself is only around 21km², and of this, only around 2km² is settled land. 'Wild' areas are actually carefully maintained by the population, and every aspect of Prisma is carefully controlled.
Prisma is an almost entirely self-sustaining society, and as such, there is only a single port on the entire island- located in the world-famous colour district, the island's city, it is the only area in Prisma that is open to tourists.
The citizens of Prisma are often recognised as their own sub-species, due to the long line of modifications to blood and appearance that have been genetically passed down through generations.
The base population of Prisma was primarily Humans and Homuna, though other human-passing species' such as Werewolves and Vampires, though the traits of these species have mostly blended into one another, and most Prismans appear human, with less than 1% of the Prisman population displaying signs of lycanthropy or vampirism.
The main identifying feature of Prismans is their blood colour, and their rituals and traditions relating to this. Due to modifications to blood colour in the original settlers of Prisma, each citizen has their own unique colour of blood. For example, instead of Humans having red blood, as is typical in other countries of Aracanus, they may have green, blue, or even black blood.
Prisman offspring almost always have a blood colour somewhere between their two parents. A yellow-blooded parent and a blue-blooded parent, for example, may create a green-blooded child.
This is not always the case, as some mutations cause offspring to have drastically lighter or darker blood, and in extremely rare cases, offspring may even have blood of a completely different hue. This is generally accepted to be a genetic throwback, usually two or three generations back.