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"That which one can look at but not see is called Yi; That which one can listen to but not hear is called Xi; That which one can grapple for but not grasp is called Wei. These three defy close inquiry, And are therefore lumped together as One. Its top is not bright; Its bottom is not dark. Lush and lasting but unnamable, It returns to a state of nothingness. This is called form without form, And image of nothingness, Known as “evasive.” From the front you don’t see its head, From the back you don’t see its rear. Applying the Dao of ancient times To harness the things of today Enables us to understand the ancient beginnings - That is called the lineage of Dao."