>> Here it was a guy, back in the 80' who even build 5 or 6 >> pyramids made of glass where he grew various kind of plants.I don't >> know if he catch the effect or not, but at least he tried... I have a glass octagonal shaped tower about 1 metre tall. Made as a fish tank. Placed inverted in my back yard it becomes crammed full of "Wandering Jew" (an enthusiastic weed). There is obviously some energy field which encourages the WJ to grow profusely within the octagonal shaped tower. You better believe it! :-) Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist