Crop circles are a passe because geeks think different!  Bernd Hopfengärtner has created what could be the  first real world "Hello world" greeting in Semacode for the visitors of Google Earth by mowing a semacode of 160x160 meters in a  wheat field. The code consists of 18 x 18 bright and dark squares producing decoded the phrase “Hello, world!”.


Nice idea; might even work for aliens who speak semacode.