In order to make the World Harmony Clock more memorable and historic, discarded shells and discarded objects picked up by students are specially added to the casting materials, expressing human's appeal for peace, not war, attaching importance to environmental protection and caring for the earth. It is understood that the World Harmony Clock has a net weight of 6 kilograms, a height of 1.2 meters and a diameter of .86 meters, which symbolizes the 6th anniversary of the founding of the United Nations.