How to make a polished aluminum foil ball - Japanese foil ball challenge

Did the foil ball challenge - took a lot of time, but pretty cool. WHAT SHOULD WE DO WITH THESE FOIL BALLS???
aluminum foil here: https://amzn.to/2u0IDoO
rubber mallet here: https://amzn.to/2KU5ThG
sander here: https://amzn.to/2lZiAtE
sandpaper here: https://amzn.to/2zjX3p3

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