Sabra Cactus

Picture of Sabra Cactus Hexagram is courtesy of "maxnathans" who published it on Flickr and wrote to me:

The cactus in question belongs to the Cereus family. they grow meters high in my garden .
A few years ago a piece broke of because of stong winds, put the piece on the ground next to my garden and after a while, little plants started to grow and now as you can see they get bigger. The plants you can see are some years old . From the top they look like a Magen David really. When they get bigger they change a bit.