The picture shows a thin sheet of pyrolytic graphite levitating above four rare-earth magnets. I would like to take a hundred of such sets (that is twenty by twenty magnets) and set up in a square with 361 levitation spots. Then cut a lot of pyrolytic graphite into circles and colour half of them white in some way. Well you get the picture.
As the magnet here is about 12mm (½inch) across the whole setup would be about the size of a regular go board. Only problem is that i estimate a total price of about 1000 USD with the best supliers of pyrolytic graphite and magnets I've been able to find.
Tas: Well... do'h... It would only be half sized, a go grid is over 2cm per line. Of course one could use one-inch-magnets but then it gets even more expensive.
External link: Scitoys levitating graphite.