Purple is a versatile color. Combining the fire of red with the serenity of blue, it has the ability to soothe as well as excite passion. Purple is prevalent in nature in everything from eggplants to amethysts, and humans have adopted it as a symbol of royalty. Here, snow-covered fir trees appear lilac during sunrise in Germany's Black Forest. The forest is located in southwest Germany, where it is known as Schwarzwald. Streetlights create a play of color on an empty street corner in Arles, a historic city in Provence, France, and the setting of many well-known works by Dutch painter Vincent Van Gogh. A close-up shows purple crocuses flecked with bright yellow pollen in Washington, D.C.