Due to the association to nature green has a calming down effect, in contrast to the colour red. Therefore in former times it was the favourite colour used in living rooms. But the expressionistic painter Wassily Kandinsky (1866-1944) didn't pay attention to the green. Due to its passive effect he called it the colour of the bourgeoisie.
The positive effect of green in therapy was already recognised by Hildegard of Bingen, a famous doctor in the Middle Ages. Still today many people walk through the green woods for relaxing and recovering. (Thomas Seilnacht)