make an antigravity boulder

http://www.amasci.com/amateur/gravrok.html

“So I started applying 20cm strips of black duct tape to the mylar bag, letting it stablize before applying the next strip to the (new) top location. That way it tells me how to distribute the duct-tape-mass evenly (I always put the next piece of tape directly across from the heaviest spot.) Then I applied smaller and smaller strips as I got closer to zero lift.”