[MMM]

Welcome to the forums.

I think your dream is interesting, but I want to give you a little info before the hawks swarm in.

Overstaying your 90 day visa is up to you, but keep in mind when you are caught you will be arrested, jailed, then put on a plane for the US with a stamp in your visa saying you can never come back.

You will not be able to rent an apartment because people with a tourist visa cannot sign year long leases.

Graffiti artists are not in demand. I think your ideas about Japan's fascination with the US is set in the mid-80s when there weren't as many foreigners in Japan and there was a lot of liquid cash to spend.

The recession we are experiencing in the US is also happening in Japan, so the number of people willing to pay $400 for custom made graffiti shoes from an unknown Chilean-American artist is not very high in 2009.

On top of that, you don't speak Japanese, so there will be no setting up shop. At best you could be a street vendor, but the first time a cop comes up....well, that's it.

Japan regulates immigration very closely. When I moved into my apartment in Japan it was only a couple days before the police showed up to let me know where the local police station was, but also to subtly let me know they knew where I live.