Two Faces of Nature is a color pencil art drawn by me. There is a tree with two faces. One happy and one sad. And on the sad side, plants are dead and the sky is dark. On the happy side, everything is vibrant. Does the tree mean something? Is the tree the cause of the duality? That is for your imagination to fill in.
But it is obvious that the whole existence comprises of duality. Yin and Yang. Happy and Sad. Up and down. Dark and Light. Some argue that there is Trinity. Which is also a valid argument but in most cases, it is just duality and polarization.