When it comes to mood, there are four primary colors. Though different shades within each of the four can have different effects.
Red symbolizes power and strength and may even stimulate aggression. Yellow is associated with joy, hope, and optimism. Green is emotionally calming and stands for harmony. Blue is the color of intellect, yet is so calming that it can lower blood pressure. As “cool” shades, both blue and green can be relaxing.
Research has found that people living in areas with more green space have better physical and mental health than those with less green space. They also compared the effects of living with a view of the ocean or of green space on residents of Wellington, New Zealand. They found that just looking out on a pure blue ocean or sea can significantly improve distress.