The 'Mystic Nativity' shows angels and men celebrating the birth of Jesus Christ. The Virgin Mary kneels in adoration before her infant son, watched by the ox and the ass at the manger. Mary's husband, Joseph, sleeps nearby. Shepherds and wise men have come to visit the new-born king. Angels in the heavens dance and sing hymns of praise. On earth they proclaim peace, joyfully embracing virtuous men while seven demons flee defeated to the underworld.