I rewatched the Muppet Christmas Carol last night and was struck by the realism of the Ghost of Christmas Present.
http://vignette4.wikia.nocookie.net/muppet/images/7/7a/Present1.jpg/revision/latest?cb=20100208054158
I assume that this particular muppet is a man in a suit, a la Big Bird, but there's a few things I could not figure out. Specifically, the eyelids open and close and the pupils move.
How did the Jim Henson company achieve this? Or is it a closely guarded secret?