As humans we respond to symbols. We express divine Beauty and insight in our art. If there is a preponderance of art depicting angels with wings, obviously this symbolizes something real within the collective consciousness. Angels appear to humans according to human capacity to accept and understand the appearance. The angels inspire, and that is what is left in our heart after an angel experience.
The deeper that sorrow carves into your being, the more joy you can contain... they are inseparable. Together they come, and when one sits along with you at your board, remember that the other is asleep upon your bed.