Yes, it is a picture of three caricatures controlled by a hand up their backside. Can you guess which hand is David Koch's? (As a hint, it's the dumbest one.)
What's not pictured was Joel Kleefisch who was chasing Big Bird around the set while yelling, "Ribeye of the sky!"
Ironically, Walker's caption read, "Taped a healthy food video with Rosita and Abby from Sesame Street." This is coming from a guy who teamed up with his fellow Teapublicans (and sadly, some Democrats) to make it harder for poor people to get food at all, healthy or otherwise.