Designing Yoda - Creature Artist Stuart Freeborn - STAR WARS: THE PHANTOM MENACE (1999)

Original Trilogy Creature Designer/Make Up Artist Stuart Freeborn visited the Phantom Menace Creature Department at Leavesden Studios, England. He talked about designing Yoda and the crew gave him a gift to thank him for his work on the original trilogy.
From 'It's Creature Film' Webisode/Documentary.

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It’s interesting how Stuart Freeborn modeled Yoda on his own facial features in addition to Einstein.