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The green leaves' angles do not obey exactly the rules of drawing a pentagram (Solomon’s seal), but I think that the first pentagram drawer might have been influenced by this innocent vegetable...
This blog (by Zeev Barkan) is dedicated to the Star of David, its history, its various meanings and usages in different cultures. It includes thousands of pictures of Star of David, six-pointed stars, hexagrams, Solomon's Seals, Magen Davids and yellow badges,and served as a resource for three books and four art exhibitions.