It's possible that yellow can have a mood-changing effect.
Those who are gifted with sight experience color so many times per day that they might take it for granted. To this effect, the hue of the sky and that of the foods you eat often goes unnoticed. According to color psychologist Hylda Rhodes, author of "The Psychology and Tradition of Color," color plays a much more profound role in our mental and physical state of being. Yellow, then, incites a particular set of responses that can affect and perhaps determine mood.
Joy
A yellow sun might bring about feelings of happiness.
Because the color yellow is often associated with sunshine, it can enhance your mood. Similarly, it is related to feelings of joy, cheerfulness, optimism and overall happiness.
Cowardice
The term "yellow streak" indicates that the color can be associated with cowardice or deceit. In this sense, yellow might encourage a jealous or suspicious mood.
Spirituality
For the spiritually minded individual, and especially those who study the chakras, yellow is said to lend clarity, productivity, and enlightenment to the mood. Much like the feelings of joy and happiness that are often associated with it, yellow in the spiritual sense purportedly allows for understanding and open communication.
Frustration
Bright yellow is often used to attract attention.
Because of the optics in the human eye, a bright, bitter yellow color can be extremely fatiguing to your eye. This shade of yellow has the potential to cause headaches and eye strain, and this physical trauma might eventually put a damper on your mood. In many instances, this type of yellow is used to indicate a hazard.
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