More than 90 Christmas trees and religious displays that show different ways of celebrating the holidays are on display in the downtown Chicago office of Cook County Treasurer Maria Pappas. This is the 15th year of “Christmas Trees from Around the World,” the display of three-foot-high trees which are decorated by members of ethnic and religious communities to represent their heritage. “Diversity is one of the Chicago area’s great strengths. It is very powerful when people come together,” Pappas said. “We see that unity in the way different ethnic groups decorate trees for the same vital holiday.” The display will be up until January 2nd in Room 112 of the Cook County Building, 118 N. Clark St.