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.
Photo shows a sketch of an impossible Star of David. It is courtesy of Dan Feldman who wrote to me that the impossible triangle and the impossible Star of David interested his son Ariel of Blessed Memory.
After his passing we found, among other things that he scribbled in his notebook, this Star of David made from six impossible triangles
Copyright: Dan Feldman © 2008.
Photo of Plastic Cube with Star of David is courtesy of Dan Feldman who wrote to me that it was a present they gave to their son Ariel of Blessed Memory for his 21st birthday, which occurred a week before his passing. In the cube there are triangles and pyramids, which create big and small Stars of David. The quality of the photo is low, but enough to illustrate the object.
The Star of David that Herzl suggested as an emblem for the Zionist Movement appears on an Austrian postage stamp issued in 1985 to mark Herzl's 125 years birthday. The Hebrew caption is written wrongly, and this is the first time I see a typo on a postage stamp. Courtesy of Ronik from Israeli Collect Forum.
Photo of Impossible Hexagram is courtesy of Dan Feldman who wrote to me that his friend Philippe Dubois managed to build it from three sorts of wood. It is comprised of two interlacing impossible Penrose Triangles.
From Hayim Shtayer collection. Militaristic style poster that appeared, so it seems, before the 1973 War. We see many IDF emblems along with portraits of Herzl (on the yellow background of a large Star of David), Golda Meir, Zalman Shazar, Moshe Dayan and Hayim Bar Lev. This Militaristic Trend died in the 1973 War, but I see even today similar posters here and there used for decorating the Sukkah.
Dan Feldman sent to me a photo of a postage stamp with six-pointed star in the center of an impossible triangle created by Oscar Reutersvard (born in 1915 in Stockholm). 
