The Garden of eden could be seen as created in the heart of mankind. We are the earth, dark and formless in the beginning. It is in the heart that the division of light and darkness takes place. Evil is a function of man and arises from the heart of man.
This is the earth from which the tree of the knowledge of good and evil takes root. This is the world we are to overcome through the separation of light and darkness.
This is the new earth that will be revealed in the image of God.