Here's a recent "behind the scenes" visit to Sesame Street done by 60 Minutes Australia. The featured Muppet/Puppet performer interviewed in this is Martin Robinson, who portrays (among others) Telly Monster, Mr. Snuffleupagus and Slimey the Worm. With the retirement of Caroll Spinney as Big Bird and Oscar the Grouch, I believe Mr. Robinson has seniority among those who play characters made of cloth…