A technician recounts working with the Muppets:
When you work with the Muppeteers, they go to great lengths to keep the characters, well, pure. The “deanimated” characters are always kept in a black satin bag, and when the move is made the place the muppet on the hand of the animator, there always seems to be a little tight crowd around them so you can’t really tell what’s going on. It’s really pretty sweet. I’ve had the opportunity to work with Elmo, Kermit, Miss Piggy and Fozzie, and each time the whole crew were standing around like grinning idiots, totally rapt the entire time. It’s generally understood that a Muppet day is a day totally lost to endless rehearsal, because it’s such a thrill to listen to those voices talk to you and your friends.