In interior decorating, we can use blue colour scheme to create a reflective, kind of ‘intellectual’ atmosphere: it’s not easy to overheat emotionally and get upset or aggressive in a ‘cool’ environment – and the color blue has actually been shown to lower our blood pressure and heart rate.
We can also use the color blue to cool down a hot, sunny room. Obviously, blue doesn’t actually lower the temperature, but it makes us feel cooler. The reverse is true when you’re decorating a north-facing room. Blue walls, flooring, or furniture can give it a distinctly ‘arctic’ feel. If you want to use the psychological effects of the color blue to create a meditative, spiritual environment, indigo is a good candidate for you.