This first map shows a change in population growth of major cities of the world from 1955 to a projected 2015. The map is easy to use, clear and legible; the symbols and labels are appropriate, and the purpose is easily identifiable; and there is structure and order. The circles/size correspond to the population of the cities originally and are proportional to each other and time. The legend is weak, if it can be called one (perhaps because it was an animation?) and there is no scale but the focus and purpose work well.