Exclusive Episode #023: Mark Dion with "Herbarium Perrine (Marine Algae)" (2006) at his Pennsylvania home and studio. Mark Dion's work examines the ways in which dominant ideologies and public institutions shape our understanding of history, knowledge, and the natural world. Appropriating archeological and other scientific methods of collecting, ordering, and exhibiting objects, Dion creates artworks that question the distinctions between "objective" ("rational") scientific methods and subjective,"("irrational") influences. Learn more about Mark Dion: http://www.art21.org/artists/mark-dion VIDEO | Producer: Susan Sollins & Nick Ravich. Camera: Joel Shapiro. Sound: Roger Phenix. Editor: Steven Wechsler.