Why do you fear trees which are tall and dark?

This is an Excellent example of an image from what Carl Jung called the Universal Unconscious. It is likely that all human beings share a common fear of tall, dark trees. It is an image that hearkens back to the most remote human ancestors who had good reason to fear predators lurking in tall dark trees. Those who did not fear such situations became prey, while those who feared and avoided those dark trees survived to pass on their genes ... and their fears ... to modern humanity.