This study of Yoda for Star Wars: The Clone Wars animated series contains detailed notes, such as "ears should have a slight wiggle on the tips like the puppet in Empire Strikes Back and as seen in CG Yoda, Episode II, III" and "Always be aware of Yoda's posture change. Only when fighting does Yoda's stance straighten and become powerful, otherwise use his traditional cane-in-hand walk and bent posture."