The Roseland Ballroom is hosting The New York City Tattoo Convention this weekend and videographer Kelly Loudenberg was onhand to capture an artist named Vincent Castiglia whose medium is human blood, the relentless buzz of dozens of needles perforating human flesh, and a lot of illustrated people. The TattooCon continues through tomorrow and tickets at the door are $18, with an all-access two-day pass going for $35.