That depends whose books you read and which websites you view and what outlook on life you have :-) Either they are just plunder from ancient Egypt placed in a decorative fashion, or they are deliberately fashioned and placed on nodes on the telleuric grid so that it can be manipulated for good or ill, allegedly by a covert organisation which started off as Knights Templar and ended up Freemasons. Or somewhere in between those extremes.
There is "evidence" to support all viewpoints on this, so basically it's as simple or as convoluted and conspiracy-ridden as you choose to believe it is.
Something is not right. This message is just to keep things from messing up down the road