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I'd say reading.
It "enriches" the unconciouss with new knowledge and stories.
I often dream of things in books but only months later.
A week ago I dreamt of two ravens. Both of them only had one eye.
I'm not sure what their meaning related to my dream is (if there is any at all) but this they're probably the two ravens of Odin, Hugin and Mugin, who leave everyday to gather news for their caretaker. Odin only has one eye so that's where that came from.
I know there isn't a huge story behind it but I find it pretty cool.