i dont know if uve gone ahead and found out already, but ill put in my 2 cents. think about it as simply as this - there are two basic types of imaginative journeys. Those that take place within the imagination and those journeys that are inspired by the imagination.
The best way to remember what the imaginative journey is to think of two movies that both fall under that category but are totally different. 2001: A Space Odyssey and Mulholland Drive.
The journey in 2001: A Space Odyssey is basically the evolution of mankind and the evolution of technology. The introduction of technology opened up the imagination to the possibility of technolgy and how we use it for destructive purposes (note the first murder at the start of the film) - and ultimately Kurbiks film is a man vs. technology sort of thing.
Mulholland Drive is noticably different, but is also an imaginative journey that is taken within the imagination. Its basically about a woman's dream - and how she dreams up this perfect state of existence where she is not miserable - where she is in love - where she is a great actress. But ultimately the dream ends and she returns to her nightmare reality.
Take these two films and relate them to Coleridge's poetry (are u studying that?) This Lime Tree Bower My Prison relates to 2001: A Space Odyssey - his imagination is opened up and he is given the ability to transcend the corporeal confines of the lime- tree bower. He is able to re-live the journey through past experiences - and in effect reaches a heightened state of an appreciation of nature he would not have experienced had he actually gone on the journey. It is because of his imagination that allows him to take that journey.
Coleridge's poem Kubla Khan is the obvious choice to relate to Mulholland Drive - it talks of an opium- induced dream where he talks about a Utopian state of existence and divulges in the beauty and mystery of nature.
I hope this helps. Basically just remember: journey that takes place within the imagination, journey that is inspired by the imagination. And remember those two films. And those two poems. That is what helps me keep my mind on track.
I think the most confusing is the journey that is inspired by the imagination - because the one that takes place within the imagination is a fairly simple concept to grasp.
If you want something else to help you with that one look at Gary Ross' Pleasantville. The arrival of Tobey Maguire and Reese Witherspoon opens up the imagination of the townspeople of the superficial black and white TV land - bringing colour into the world as they all discover sex, spontaneity, change, etc. Even the intruders are willing to change, as they too open up to a new world outside their own and come out the end as different people.
Hope this helps.