Notice in beating the system he became the system?
From what I've read, George Lucas had only vaguely heard of Campbell when he made the first 3, and attended some of Campbell's lectures afterwards.
Kurosawa and science fiction schlock were his early influences from what I've read.
C-3PO and R2-D2 are based off of two characters from Hidden Fortress, and Yoda is based off the character Dersu Uzala from the movie Dersu Uzala. (Dersu Uzala is a siberian hermit who teaches an explorer about survival skills and the meaning of life, and talks in a sort of backwards broken grammar)
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