In the autumn the hint at the decline that was first felt in late summer has now turned into rapid loss. It is the time to let go of any and all burdens no longer necessary. There is a special feeling at this time, one of quality not quantity.  This can be seen in the beautiful colors of the leaves on the tree, or that certain quality of light only found at this time of year.  The Lung and Colon exemplify this time and so too the Metal Element as the Lung is how we take in and the Colon is how we let go.  The Lungs take in only the fine pure things that we need and the Colon is responsible for eliminating all that is no longer necessary for us.