Because I need a quick, handy guide on worldbuilding, let's discuss colours as they are used across Eorzea.

What are some examples of different colours being used to represent certain concepts in-game?

Additionally, does anyone have any info on different NPCs wearing certain colours? For example, I heard somewhere that the conjurers of Gridania wear different-coloured robes based on their rank or seniority, how does that work out? What colour represents a junior conjurer, and what represents a senior?