Writer/Director Shane Carruth's new film "Upstream Color" has a new trailer. Carruth is best known for his independent film "Primer", which was honored at the 2004 Sundance Film Festival with the Grand Jury Prize. Carruth, a former software engineer with an undergraduate degree in mathematics, utilized his technical knowledge on the project. "Upstream Color" is his first film in almost 10 years. His next project, a science fiction film tentatively entitled, "Topiary", is currently in development.