Joy is the perception of beauty, unlike happiness, which is because of something. Joy is singing of the heart, a feeling of praise.
With the word creative we stand under a mystery. And from time to time that mystery, as if it were a sun, sends down upon one head or another, a sudden shaft of light—by grace, one feels, rather than deserving, for it always is something given, free, unsought, unexpected. It is useless, possibly even profane, to ask for an explanation.