Blue is known to have calming effects and is considered an intellectual color. Blue has the converse reaction that red does, as it affects us strictly mentally. According to Angela Wright, a recognized expert on the unconscious effects of color, brighter blues will stimulate the atmosphere in your home, aiding you in clear thinking, while softer blues have a calming effect on the atmosphere and can help you concentrate. A soft blue would be a nice choice for a sitting room or library, considering its calming qualities.