For funsies, I decided to draw a puppet form for Yol, which I imagine to be more akin to a marionette or automaton than the other felt-based puppets on the cast.
Moving him was bizarrely complex, with many levers and dials controlling the largely internal string clusters for his multiple joints, and even the mechanisms for a full range of facial movements. It required many hours of training to get right, but the results were described as "mesmerizing", to the point where more than a few people questioned what a doll of this high quality and detail was doing on a simple kid's show. The studio itself refused to give a response.
As for material, he was made of something labeled/assumed to be wood, but which resembles no wood found on earth, and which those who handled him decribed as "strangely soft, and almost warm to the touch." It's also notable that his head contained a full set of real ivory teeth, despite such a feature not being present in any other character on the show. Further analysis is unfortunately impossible, as all 8 of the original Safety Space puppets mysteriously vanished during the summer of 1972 and have never been found since.
bonus pic of the swirl markings covering his body, which I later gaussian blurred and lowered the opacity to give that distinct velvet softness to his skin.