Jim Henson’s universe: Muppets, ‘Sesame Street,’ Fraggles and more, all in one traveling exhibition

The first thing one expects in an exhibition devoted to Jim Henson is a kind-eyed, green amphibian made of felt. And, yes, Kermit the Frog welcomes visitors to a new Henson installation at the Skirball Cultural Center.

Perhaps the last thing visitors might expect, though — even those well-versed…