The internet abounds with techniques for teaching elementary schoolers the difference between warm and cool colors—an often-invisible, somewhat flexible line down the middle of the color wheel to ...

Even though the sky may obviously be blue to us, this is not an objective fact. In many cultures around the world, the labeling of different hues is more subjective than we might be inclined to think.

Color is, and always will be, a personal choice. While some of us feel calmest when wrapped up in soft blue walls, others feel their best when bright yellow swathes a room in cheerful vibes. But if ...