ELI5: Explain Like I'm 5

Immanentism

Immanentism is a philosophical idea that says all of reality, or existence, is inside of us rather than out side in the world. It means that the things we think and feel, as well as the things we see and touch, are all happening in our mind and not somewhere else. To put it simply, it means that the world is inside of us and not outside of us.