I really like street art. Some, like darkcloud, are artsy and original. Others, like 5003, amaze me with their omnipresence. One tag, "Goner," is everywhere -- from newspaper stands in Allston to Fenway to doorways in the most remote alleys of Cambridge.
Just like the drawings, paintings and stickers these people plaster everywhere, many of them have equally as cryptic web sites. I'm guessing that 5003world.com is the same guy/group that plasters cities with sheep doodles.