Self-preservation, on the other hand, was associated with the regenerative powers of the green plant world. These four basic colors and their meanings persist throughout the world today. The dramatically different effects of warm and cool colors have been documented time and time again in scientific studies. Perception of time is influenced by color. In color studies, time seems to pass more slowly in a red room and more quickly in a blue or green room.
Perception of temperature is affected too.
We actually feel warmer in a red room and cooler in a blue room. Desire for food is also influenced by color. Bright, warm colors tend to stimulate the appetite, while soft, cool colors retard it. If the physical and psychological needs of people are to be well served, colors should be chosen carefully to create a healthy, balanced emotional atmosphere. Rooms with little natural light should have light colors on the walls and in the furnishings.