Today I posted the following note to the editor of the "Star of David" page on Wikipedia:
You wrote: "However, the sign [Star of David] is nowhere to be found in classical kabbalistic texts themselves, such as the Zohar, the writings of Rabbi Isaac Luria and the like".
I read on G.S. Oegema's book (Realms of Judaism, The history of the Shield of David, the birth of a symbol, Peter Lang, Germany, 1996, ISBN 3-631-30192-8) that "Isaac Luria provided the Shield of David with a further mystical meaning. In his book "Etz Hachayim" he teaches that the elements of the plate for the Seder evening have to be placed in the order of the hexagram: above the three sefirot "Crown "Wisdom" and "Insight", below the other seven".