http://longnow.org/clock/

This is an awesome project. This clock will play a different melody for 10,00 years! It raises a lot of questions in the aspect of long-term thinking. One really interesting question that this project raised was, “If the Clock keeps going after we are personally long dead, why not attempt other projects that require future generations to finish?” That is a really interesting concept and I believe that question will be seriously considered and there will soon be some sort of project that requires multiple generations to finish.