My theory is that Iris isn't even tied into the tree or Esurio for that matter. I think that the tree, Iris, and Esurio are all simply manifestations of Colby's mind. Colby has some sort of gift that allows him to distort reality, although he doesn't know that he has this gift. His subconcious just sort of brings to the surface what ever he's thinking about out.
1. Iris feel from the sky when he was looking at it.
2. When Colby wished he was home, he simply appeared there.
3. Colby's dreams of an empty telephone booth - combined with the voice on the broken telephone - bring to life Esurio, who's forehead looks strangely like a rotary dial.
4. Iris hasn't a clue as to what's going on, because it's not her doing, it's Colby's. That's why she has no past - she was created on the spur of the moment.
5. Colby's unconciously looking for an exit from the troubles his life has, so his mind creates a tree that he climbs down with almost no hesitation. Note that it didn't open up until he stood in front of it. Once again, Iris had nothing to do with the creation of the tree.
6. The letters in the alphabet soup are a small sample of Colby's telekenetic powers. Note that he questions reality, and "Am I OK?", not if everything around him is OK. The problem his mind is trying to deal with is in himself.
7. Colby's powers affect not only himself, but other people around him, as in the case of Blake. Secretly, Colby's calling in life is to help others reach their lost goals (although he doesn't know it yet), as in the case of Esurio telling Blake how he can achieve his, and Blake's brief vision of being a king (and without glasses mind you :->).
I wonder if there is secret meaning behind "Esurio". Spelled backwards, it is "oiruse", which might be a pun on "Our use", showing that Colby's mission in life is to bring to reality the dreams of other people.
Any of this sound legite?