Red, the color of human blood, symbolizes passion, fire, love, and anger. In Eastern cultures, it also connotes luck and prosperity. Red occurs throughout nature, from dying stars to dying leaves, and humans have evoked its powers for everything from politics to sports.
Here, Samburu families celebrate during a three-day wedding ceremony in Kenya. Several days of elaborate ceremonies are designed to counteract superstitions and bring the new couple good luck.
(For more pictures of the amazing colors of our world, buy the National Geographic book Life in Color.)