If it’s been a while since you’ve had a productive day in your office, it may be time to repaint, especially if your walls are white. In a study from the University of Texas, researcher Nancy Kwallek found people working in white, off-white or gray rooms got less done and made more mistakes than those in red or aqua rooms. “White doesn’t help us be productive,” Kwallek told Fast Company, explaining that white isn’t conducive to work.