Yin and yang (or 陰 and 陽 in traditional Chinese characters) represent duality, or the idea that two opposite characteristics can actually exist in harmony and complement each other. It's the same idea behind quotes like, "there can be no light without darkness. Beautiful Handcrafted Shadow 6 x 8" box with a wooden yin yang center with Hematite,Black obsidian, Clear Quartz, Titanium Points!