Tracks sun and moon to make tricity.
Seems like it would be super expensive and require a lot of energy to produce
http://share.banoosh.com/2012/09/20/giant-marble-harvests-energy-from-sun-and-moon/
Seems like it would be super expensive and require a lot of energy to produce
http://share.banoosh.com/2012/09/20/giant-marble-harvests-energy-from-sun-and-moon/
![Giant marble solar tracking/collection Giant marble solar tracking/collection](/talk/proxy.php?image=http%3A%2F%2Fshare.banoosh.com%2Fwp-content%2Fuploads%2F2012%2F09%2F6a00d8341bf67c53ef017c31ed490b970b-800wi.jpg&hash=f435918c4107905c6bb507ac9f568405)