Full context:   Wuxing was first translated into English as "the Five Elements", drawing parallels with the Greek and Indian Vedic static, solid or formative arrangement of the four elements. This translation is still in common use among practitioners of Traditional Chinese medicine, such as in the name of Five Element acupuncture and Japanese meridian therapy. However, this analogy could be misleading as the four elements are concerned with form, substance and quantity, whereas the post-heaven arrangement of the wuxing are "primarily concerned with process, change, and quality". For example, the wuxing element "Wood" is more accurately thought of as the "vital essence" and growth of trees rather than the physical innate substance wood. This led sinologist Nathan Sivin to propose the alternative translation "five phases" in 1987. But "phase" also fails to capture the full meaning of wuxing. In some contexts, the wuxing are indeed associated with physical substances. Historian of Chinese medicine Manfred Porkert proposed the (somewhat unwieldy) term "Evolutive Phase". Perhaps the most widely accepted translation among modern scholars is the "five agents" or "five transformations".