It is usually a horizontal evergreen wreath with four candles, sometimes with a fifth, white candle in the center. Beginning with the First Sunday of Advent, the lighting of a candle can be accompanied by a Bible reading, devotional time and prayers. An additional candle is lit during each subsequent week until, by the last Sunday before Christmas, all four candles are lit. Many Advent wreaths include a fifth, Christ candle which is lit at Christmas Eve or Christmas Day. The custom is observed both in family settings and at public church services.