Fantasies

I had a moment of thought about fantasies. Unfortunately it was while I was away from this keyboard. I think that I consider fantasies somewhat frivolous thoughts that really cannot be built upon. Daydreams, however can be big ideas. Daydreams are of the heart. Fantasies are of the loins? 

Whilst riding my motorcycle to work I was thinking about James Joyce's Ulysses. I have read approximately 200 pages and find it somewhat impenetrable and fascinating. It is largely Daydream. The book goes into a sort of poetry that transcends time and becomes a free-associative line of thinking about and around the events at that moment in the book. It veers seamlessly between reality and the poetic musings of and about that reality. It is a daydream that has been somehow delineated in language. This probably contradicts my earlier statement about language perhaps being an enemy of Daydreams. Now, perhaps I should ask an obvious question: Is the book part fantasy? Again, I fall on the side of Daydream. I have difficulty attributing such depth to a fantasy. I am still unable to define the difference. My only definition seems to be based upon how I feel about the word. 

In looking up the definitions of both Daydream and fantasy, I find that Daydream and fantasy are synonyms and that there are many more definitions for fantasy. Daydream is simply "reverie while awake". Fantasy includes "imaginative conceptualizing".  This among eleven other definitions. It seems that I might be mistaken in using the word Daydream in spite of an emotional attachment to it.

So, if I follow the word fantasy or fantasize, then I have to ask: am I good at "imaginative conceptualizing" and the other eleven definitions? A supposition based upon no solid foundation, visionary idea, illusion? Have I instead found something else I am not so good at? I had a feeling that this would cause me trouble.