There is some evidence that colors affect physiologically. For example, when subjects are exposed to red light, respiratory movements increase; exposure to blue decreases respiratory movements. Similarly, eye blinks increase in frequency when eyes are exposed to red light and decrease when exposed to blue. This seems consistent with the intuitive feelings about blue being more soothing and red being more arousing. After changing a school's walls from orange and white to blue, the blood pressure of the students decreased while their academic performance improved.