Editor: We all remember Advent Calendars when we were kids - behind each day of the month there was a different picture. Here is the Modern animated version. Each day in December a new window will open to reveal a new animated character. This demo will actuallWe all remember Advent Calendars when we were kids - behind each day of the month there was a different picture. Here is the modern animated version. Each day in December a new window will open to reveal a new animated character.