Advent wreaths are circular, representing God's infinite love, and are usually made of evergreen leaves, which "represent the hope of eternal life brought by Jesus Christ". Within the Advent wreath are candles that generally represent the four weeks of the Advent season as well as "the light of God coming into the world through the birth of Jesus Christ" although each of the candles can be attributed its own significance as well; in one version of such interpretation, the candles specifically symbolize the Christian concepts of hope (week one), peace (week two), joy (week three) and love (week four). Many Advent wreaths also have a white candle in the centre to symbolize the arrival of Christmastide, sometimes known as the "Christ candle." It is lit on Christmas Eve or Christmas Day. The Christ candle is coloured white because this is the traditional festal colour in the Western Church. Another interpretation states that the first candle is the Messiah or Prophecy candle (representing the prophets who predicted the coming of Jesus), the second is the Bethlehem candle (representing the journey of Joseph and Mary), the third represents the shepherds and their joy, and the fourth is the Angel's candle, representing peace.