A common complaint in today's automotive press, and often among buyers, is that all cars these days look the same. A few colors are trendy both in the United States and around the world, and they are, well, not colorful. Eye-catching car colors are still found on sports cars, halo vehicles, and limited editions. But they are vastly outnumbered by sober, conservative, achromatic colors. So how did these colors get to be so popular? It has to do with practicality, human psychology, and technology.