Plants appear in art, either to illustrate their botanical appearance,[56] or for the purposes of the artist, which may include decoration or religious symbolism. For example, the Virgin Mary was compared by the Venerable Bede to a lily, the white petals denoting purity of body, while the yellow anthers signified the radiant light of the soul; accordingly, European portraits of the Virgin's Annunciation may depict a vase of white lilies in her room to indicate her attributes. Plants are also often used as backgrounds or features in portraits, and as main subjects in still lifes.[57][58]