Color therapy is based on the assumption that colors have an effect on the human psyche and affect the organism. Each color has a certain wavelength and energy in which it vibrates and thus unfolds a different effect. For example, red has a stimulating effect, while blue has a calming effect. The importance of colors is also used in hypnotherapy. Certain color suggestions can be effective in the hypnosis session. Color suggestions are also particularly successful because the brain areas for color perception are particularly active during hypnosis.