Red, of course, is the colour of the interior of our bodies. In a way it's inside out, red. Anish Kapoor (Indian-British sculptor)

Red is bold, vibrant, gets your attention, and tells you to STOP.

It's also the color of sunsets and a power color. It's passionate, it represents love, and it's also my favorite color, I'm inexplicably drawn to it and can't say how many pairs of red shoes I own. 
People "see red" when enraged, and Mars is the red planet. It is a base primary color, from which many other colors are derived. It's the color of blood, and historically associated with sacrifice, danger and courage. It's heat, activity, sexuality, desire, longing, lust, malice, wrath, stress, action, vigor, will power, radiance, determination and one of the first colors used in prehistoric art. 
In many Asian countries, it symbolizes happiness and good fortune used often in fung shui. In China, Palace gates and walls were covered in red as well as early pottery. It was the traditional color for Chinese wedding dresses, and continues to be in Indian cultures, symbolizing purity. The red in South Africa's flag symbolizes bloodshed and sacrifices made in its struggle for independence. Ancient Egyptians and Mayans colored their faces red in ceremonies. Roman generals had their bodies covered in red to celebrate victories.

Renaissance wealthy and nobility wore it as a symbol of status. It also became the color of revolution. In Russia, it was associated with beautiful, good or honorable. The eminent Red Square is one of the most famous examples of the beautiful/red connection. It enhances metabolism, increases respiration rate, and raises blood pressure. It attracts attention more than any other color, a primary reason why fire engines are typically red and many company's use the color in their branding. Psychologists believe too much red creates aggression, anger, loss of temper and oppressive behavior and although I've never experienced that, I have had "the red-carpet treatment', "painted the town red" and been "in the red" once or twice.

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