The tree of knowledge was a good metaphor for describing our knowledge of life and how things connected one another. The concept has been around for quite sometime. The tree as metaphor is now becoming recognized as not sufficient enough to really explain the connections. This RSA Animate video shows how the network or web of life is a better view.
Of course, if we are fortunate to stick around for awhile, there may also be a better metaphor discovered as our understanding of life continues to develop.
What do you think about this?