Seven colors of the rainbow stand for seven types of art:
2 representational art
7 cinema (synthesis)
As seven notes in music, seven colors of the rainbow help see and learn the world. The rainbow with its bow is associated with the letter D and its reflection resembles the letter C. Its round shape stands for the globe and the sun.
The rainbow appears after stormy weather. Here the rainbow appears after war and natural disasters! It brings HOPE and OPTIMISM.
I do not think that there is a child who has not smiled seeing the rainbow.
The bow also symbolizes an arch, roof, altar, educational institution.