The Smithsonian Institution in Washington on Saturday unveiled its latest exhibit, "Jim Henson's Fantastic World," featuring 14 of Henson's famous Muppet creations, including many of those from Sesame Street, such as Bert and Ernie and Kermit the Frog. The exhibit, scheduled to remain at the Smithsonian until October, before traveling on a three-year tour to seven other cities, displays Henson's creative process. "We're showing how he went from drawing to a cartoon to a puppet to a moving image," project director Deborah Maconic told the Associated Press. Since the Muppet characters are subject to fading, they are being displayed under special lighting and are being treated as if they were historic treasures, placed behind glass enclosures. "We consider every single thing in here to be precious," Maconic said.