Why do the faces change for Jonas at the ceremony?

At the Ceremony of Twelve in "The Giver," Jonas perceives the faces of the community members changing due to his awakening awareness and the deepening of his emotions. As he begins to see beyond the surface, he recognizes the complexity of people's feelings and the underlying individuality that the community suppresses. This shift symbolizes his growing understanding of concepts like love, choice, and the depth of human experience, which starkly contrasts with the uniformity enforced by the society around him. The changing faces represent his journey toward enlightenment and the emotional richness that is absent in his controlled environment.