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I like to think Yoda became a powerful Force adept living in a swamp because the Force comes from all living things and swamps are teeming with life. That's how I saw it when I was 12 years old, and nothing since has made more sense than that. definitely don't like the idea that Yoda the reptile used to live on a planet that was completely covered by a city, and that Jedi used to hang out in a tower and talk all day about prophecies and politics.
Civilian number 2, you hit the nail on the head for my feeling on Yoda as well. I was 14 at the time, and that was my
EXACT thought on the subject. Especially given Yoda's lecture to Luke about the nature of The Force. The choice of "nature" of the Force to me was revealing, because it seems to harken back to animist ideals of the symbiosis of people, animals, plants and the earth iself - forgive me, I am probably not accurate in the descriptions, but it is a general idea.
Obi Wan, as well, explained the Force to Luke, saying, "The Force is an energy field created by all living things; it surrounds us and penetrates us, it binds the galaxy together."
Alec Guinness absolutely
OWNED his role as a wise old man, and "Brilliant" would have damned him with faint praise, when he gave that little speech.
To get back on track, one thing that also occurred to me with the cave was that perhaps Yoda deliberately CHOSE to live in the wilderness, and cast out any remaining darkness that was within him, much like the description of the Vulcans of Star Trek casting out their animal passions (emotions) into the sands of the deep desert, and giving themselves over completely to logic, through the Kohl Ih Nahr (sp?) ritual.
However, in the case of the Force that darkness has to go SOMEWHERE, and Yoda chose to cast it into the caves/tree, so that any Jedi aspirant that came along could have a more or less safe testing ground and actually experience the Dark Side of the Force first hand, without having to face down a Sith, or equivalent, and Yoda would be there to watch them, to see if they measured up to the Jedi ideals.