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From:
Brian Patrick Flynn
Yellow: Hello, Sunshine
No color epitomizes cheerfulness and high energy like yellow. Intense shades such as canary yellow are extreme attention grabbers, which is why the color is used for traffic signs or in advertisements. Although associated with positivity and sunshine, it's also the most optically straining color due to the amount of light it reflects and has been known to encourage babies to cry. That being said, yellow works best when used in small amounts.