Yin and Yang.
Two opposing forces that are complementary of each other. They are independent and yet interconnected. They are adamantly against each other but desperately need each other to live.
This dualism in cosmology is shared in many aspects of life. Sith vs Rebels. God vs Satan. Light vs Dark. Good vs Evil. It’s a simple idea that can be applied to many things, but can also be a complex thing to master.
It’s this central theme at the heart of Astrea that makes it so fun.