Warning: Chances are you'll never view the world quite the same once you've done the following experiment! On a bright, sunny day, go outside and look at your thumb. In particular, look very closely at your thumbnail while holding it in direct sunlight (use a small, high-powered magnifier if you've got one handy). You'll see a myriad of tiny grainy looking colored specks. What's going on? You're seeing an effect, most commonly observed with lasers—called speckle by scatter-minded individuals.