This is so cool! The Infinity Project is about a guy that makes solid glass “planets” out of multicolored glass, and then he plants them in various parts of the world to be “discovered” at a later date. *grin* “It’s fun to hide my Planets and have people find them, perhaps hundreds of years from now. I got the idea one Spring while digging garden beds. I found several marbles that children had lost sixty or seventy years ago, and they were as colorful and bright as the summer afternoon they were misplaced. In the past twenty years, friends and I have placed Planets in exotic and mundane locations all over the Earth. To find one, you just have to start looking.” (Once again, thanks for the link, Metafilter.)