The observance of Christmas around the world varies by country. The day of Christmas, and in some cases the day before and the day after, are recognized by many national governments and cultures worldwide, including in areas where Christianity is a minority religion. In some non-Christian areas, periods of former colonial rule introduced the celebration (e.g. Hong Kong); in others, Christian minorities or foreign cultural influences have led populations to observe the holiday. Christmas traditions for many nations include the installing and lighting of Christmas trees, the hanging of Advent wreaths, Christmas stockings, candy canes, setting out cookies and milk, and the creation of Nativity scenes depicting the birth of Jesus Christ. Christmas carols may be sung and stories told about such figures as the Baby Jesus, St Nicholas, Santa Claus, Father Christmas, Christkind or Grandfather Frost. The sending and exchange of Christmas card greetings, observance of fasting and special religious observances such as a midnight Mass or Vespers on Christmas Eve, the burning of a Yule log, and the giving and receiving of presents are also common practice. Along with Easter, Christmas is one of the most important periods on the Christian calendar, and is often closely connected to other holidays at this time of year, such as Advent, the Feast of the Immaculate Conception, St Nicholas Day, St. Stephen's Day, New Year's, and the Feast of the Epiphany. Many national governments recognize Christmas as an official public holiday, while others recognize it in a symbolic way but not as an official legal observance. Countries in which Christmas is not a formal public holiday include Afghanistan, Algeria, Azerbaijan, Bahrain, Bhutan, Brunei Darussalam, Cambodia, China (excepting Hong Kong and Macau), the Comoros, Iran, Israel, Japan, Kuwait, Laos, Libya, the Maldives, Mauritania, Morocco, North Korea, Oman, Qatar, the Sahrawi Republic, Saudi Arabia, Somalia, Taiwan (Republic of China), Tajikistan, Thailand, Tunisia, Turkey, Turkmenistan, the United Arab Emirates, Uzbekistan, Vietnam, and Yemen. Countries such as Japan, where Christmas is not a public holiday but is popular despite there being only a small number of Christians, have adopted many of the secular aspects of Christmas, such as gift-giving, decorations, and Christmas trees. Christmas celebrations around the world can vary markedly in form, reflecting differing cultural and national traditions. Among countries with a strong Christian tradition, a variety of Christmas celebrations have developed that incorporate regional and local cultures. Geographical variation Africa Ethiopia and Eritrea