Discover the path to the Bethlehem manger as you mark the days of Advent with this unique pop-up window calendar. When Advent begins, lay the calendar on a table or mantelpiece. Each day of December, lift up a numbered window. What will pop up? A shepherd or sheep? An angel or Wise Man? Perhaps the Bethlehem stable! When Christmas arrives, an entire nativity scene appears where there once was an empty road, a wonderful reminder that God called the world to seek out the Savior born in Bethlehem.