A circle of greenery, marked by four candles that represent the four Sundays of the season of Advent. An additional candle is lit as each new Sunday is celebrated in Advent. Advent wreaths are used both in churches and in homes for devotional purposes. The candles may be blue, purple, or lavender, depending on local custom. Some Advent wreaths include a white candle in the center known as the "Christ Candle," which is lit on Christmas Eve.