I agree it is significant that Frodo has the dream at Tom's house. Off the top
of my head... In Tom's house Frodo is for the first time 'on his way' in
his journey. There is no Gandalf or Aragorn to guide him, and Tom brings
him into his house in a very fatherly way. To highten this, Tom's
transcendence over power gives his dwelling a very timeless and weightless
atmosphere. If you think about it, his house has the 'feeling' of an
afterlife. I really think Frodo is beginning to find his place in the
world when he is at Bombadil's. Everything in his world is changing, and
the people and places all have new meanings. Someone once suggested that
Ulmo sent Frodo the dream at Bombadil's due to it's proximity to the sea...
which may be relovant, but to try to sum up my point... I think Bombadil's
house itself is a foreshadowing of the Grey Havens and the Undying Lands.
And Bombadil could possibly be a (i'm going to make up a word)
Foreshadowed-Symbol of
Eru.
"Will you look into the Mirror?"
