Primary colors—you probably haven't used them since some grade school art class. But red, yellow and blue are making a comeback in a major way. [ed note: they aren't]. Here are all of your best, primary color shots.
Orange and blue. Red and green. These timeless color combinations aren't just coincidences, they're complementary colors. And for this week's Shooting Challenge, you'll exploit the very nature of human perception to capture a photo with incredible vibrance.