Or maybe we're experiencing some actual organic imagination. That doesn't fly in the face of science. Our world literally is largely created by our imagination. Your fences first appeared in your mind, right? As have all your carvings and other work.

And, our perception of the world is entirely based on imagination. Our perception of a tree, for example, as a separate thing is created by our brain. Does that tree even exist? How could it possibly exist independently of its environment? It couldn't. So it IS the environment, but we perceive it as something separate, individual. We perceive ourselves in the same way.