What is the significance of a rainbow in paintings?

Rainbows in paintings often symbolize hope, renewal, and the promise of peace following turmoil, drawing from their natural appearance after storms. They can also represent diversity and unity, merging different colors into a harmonious whole. Additionally, rainbows may evoke a sense of wonder and joy, enhancing the emotional impact of a piece. Artists use them to convey complex themes, making the rainbow a powerful visual motif.