In some cases, popular aspects of Christmas, such as Christmas trees, lights, and decorating are still prominently showcased, but are associated with unspecified "holidays" rather than with Christmas. The controversy also includes objections to policies that prohibit government or schools from forcing unwilling participants to take part in Christmas ceremonies. In other cases, the Christmas tree, as well as Nativity scenes, have not been permitted to be displayed in public settings altogether. Also, several U.S. chain retailers, such as Walmart, Macy's, and Sears, have experimented with greeting their customers with "Happy Holidays" or "Season's Greetings" rather than with "Merry Christmas".