Can you guess the medium used to create these art pieces?Robbie Gonzalez11/04/11 8:00pm161EditPromoteGo to permalinkFinnish artist Erno-Erik Raitanan has created a visually arresting series of art pieces using a most unusual medium. Can you guess what it is? What if I told you that the name of the series is "Bacteriograms"? Give up? Answers after the jump.