Yes, Amergin, I may write about falling in love with a non-human (the editor/organizer has let me know that she is writing about falling in love with her garden... But that's not how I would use the term)

Earlier, Bat Goddess made the point that it's not so much "falling" in love as being surprised by love... Personally, I think that that may be where the idea of falling in love came from.

You never expect to fall over, but all of a sudden, there is a split-second of zero gravity, and the ground beneath your feet isn't there any more (it's under your rear, or your nose, or your knees, instead ;-)). So I've always equated "Falling in love" with a sudden, unexpected feeling for some one or thing, accompanied by a change in perspective about your own world and assumptions. (same sort of associations with getting shot by an arrow... interesting that in Eros's/Cupid's case, he shot both arrows of love and hate -- a sudden, strong feeling for someone need not be warm fuzzies)

Most love, I imagine, is "grown" rather than "fallen" into -- a gradual growing awareness of the value of this person or thing in your life.

Turning this to a music thread -- there are lots of songs about "falling" into love... what about the "growing" into love? Off the top of my head, I can't think of any -- not intense enough?