It's my appreciation of phonoaesthetics I guess. Nothing sinister, Mrjamon. It comes from J. R. R. Tolkien's 1955 essay "English and Welsh":

"Most English-speaking people...will admit that cellar door is 'beautiful', especially if dissociated from its sense (and from its spelling). More beautiful than, say, sky, and far more beautiful than beautiful. Well then, in Welsh for me cellar doors are extraordinarily frequent, and moving to the higher dimension, the words in which there is pleasure in the contemplation of the association of form and sense are abundant."

And very difficult for owls to hoot.