The rainbow is a natural phenomenon that has inspired awe across different cultures and religions. It forms when sunlight refracts, reflects, and disperses in water droplets in the atmosphere, creating a spectrum of colors. While it is often associated with seven primary colors—red, orange, yellow, green, blue, indigo, and violet—the actual number of visible colors can vary due to environmental conditions.

Throughout history, the rainbow has held deep symbolic meanings. In ancient Greek mythology, it was seen as a bridge between gods and humans, symbolized by the goddess Iris. In the Bible, the rainbow appeared after the flood, serving as a symbol of God’s promise. Similarly, various cultures have their own interpretations, from the rainbow as a sign of mercy and connection between heaven and earth, to warnings of death and otherworldly encounters in certain African and Asian myths.

In psychology, the rainbow's colors carry specific meanings: red represents passion and energy, orange symbolizes creativity, yellow is associated with optimism, green with prosperity, blue signifies trust and spirituality, indigo with introspection, and violet with transformation. Each color also connects to different chakras, planets, and even historical beliefs about the rainbow's influence on the world.

Scientifically, the rainbow is a result of the dispersion of light through water droplets, and its colors correspond to specific wavelengths. Isaac Newton, fascinated by the mysticism of numbers, formalized the idea of seven colors, although rainbows do not have fixed boundaries, and some cultures recognize fewer or more colors. The human eye can distinguish these colors only within a limited range of wavelengths, leaving many colors in the spectrum invisible to us.