The New York Times has used stacks of Monopoly plastic hotels to explain what the cost of the U.S. political campains means in terms of households. Though closer to concrete scales than it is to data visualization (that usually presents data in a more structured manner), this representation made of physical pieces from the famous board game makes the message particularly compelling.
According to the New York Times,
Just 158 families have provided nearly half of the early money for efforts to capture the White House.
of which the animated webpage gives a good sense of scale.
Source: The New York Times, 2016 Presidential Election Super Pac Donors Oct. 10, 2015.