The late Jim Henson, creator of the Muppets, often had private exploratory performance sessions to test new puppets and characters. They were all done in his company's facilities, and for strictly inhouse use and evaluation. This excerpt, from a tape belonging to the estate of the late Muppet designer/builder Tim Miller, features prototype puppets performed by Jim Henson, Camille Bonora, David Rudman, and Rick Lyon. Thanks to James Wojtal Jr. and Ken Plume. (PS, yes, there's a typo on one of the title slides. Oops.)