The light spectrum is like a rainbow that shows all the colors of light. Each color in the rainbow has a different wavelength, which is like how stretched out or squished together the waves of light are. The wavelength determines the color we see—longer wavelengths make us see red, while shorter wavelengths make us see blue or violet. Violet light and blue light have the shortest wavelengths, while red has the longest visible wavelength of 635-700nm.^[1]

Designers can use this knowledge to create color combinations that are visually appealing and communicate the right mood or message. For example, colors with longer wavelengths, like red and orange, are often seen as warm and energetic, while colors with shorter wavelengths, like blue and violet, are perceived as calm and cool. By understanding how wavelengths affect color perception, designers can choose colors that enhance the user experience and evoke the desired emotional response.