Yellow is psychologically the happiest color in the color spectrum. Yellow shines with optimism, enlightenment, and happiness. Shades of golden yellow carry the promise of a positive future. Yellow will advance from surrounding colors and instill optimism and energy, as well as spark creative thoughts. Yellow stimulates mental processes and the nervous system, activates memory and encourages communication.
"Yellow" ("giallo"), in Italy, refers to crime stories, both fictional and real. This association began in about 1930, when the first series of crime novels published in Italy had yellow covers. The term "yellow movie" (黃色電影) can refer to films of pornographic nature in Chinese culture, and is analogous to the English "blue movie". Lastly, it is associated with sensational journalistic practices, or yellow journalism, and resistance to militant trade unions. Reference: Wikipedia